/**
 * @license Angular v12.2.13
 * (c) 2010-2021 Google LLC. https://angular.io/
 * License: MIT
 */

import { InjectionToken } from '@angular/core';
import { Injector } from '@angular/core';
import { ModuleWithProviders } from '@angular/core';
import { Observable } from 'rxjs';
import { XhrFactory as XhrFactory_2 } from '@angular/common';

/**
 * A multi-provider token that represents the array of registered
 * `HttpInterceptor` objects.
 *
 * @publicApi
 */
import * as ɵngcc0 from '@angular/core';
export declare const HTTP_INTERCEPTORS: InjectionToken<HttpInterceptor[]>;

/**
 * A final `HttpHandler` which will dispatch the request via browser HTTP APIs to a backend.
 *
 * Interceptors sit between the `HttpClient` interface and the `HttpBackend`.
 *
 * When injected, `HttpBackend` dispatches requests directly to the backend, without going
 * through the interceptor chain.
 *
 * @publicApi
 */
export declare abstract class HttpBackend implements HttpHandler {
    abstract handle(req: HttpRequest<any>): Observable<HttpEvent<any>>;
}

/**
 * Performs HTTP requests.
 * This service is available as an injectable class, with methods to perform HTTP requests.
 * Each request method has multiple signatures, and the return type varies based on
 * the signature that is called (mainly the values of `observe` and `responseType`).
 *
 * Note that the `responseType` *options* value is a String that identifies the
 * single data type of the response.
 * A single overload version of the method handles each response type.
 * The value of `responseType` cannot be a union, as the combined signature could imply.

 *
 * @usageNotes
 * Sample HTTP requests for the [Tour of Heroes](/tutorial/toh-pt0) application.
 *
 * ### HTTP Request Example
 *
 * ```
 *  // GET heroes whose name contains search term
 * searchHeroes(term: string): observable<Hero[]>{
 *
 *  const params = new HttpParams({fromString: 'name=term'});
 *    return this.httpClient.request('GET', this.heroesUrl, {responseType:'json', params});
 * }
 * ```
 *
 * Alternatively, the parameter string can be used without invoking HttpParams
 * by directly joining to the URL.
 * ```
 * this.httpClient.request('GET', this.heroesUrl + '?' + 'name=term', {responseType:'json'});
 * ```
 *
 *
 * ### JSONP Example
 * ```
 * requestJsonp(url, callback = 'callback') {
 *  return this.httpClient.jsonp(this.heroesURL, callback);
 * }
 * ```
 *
 * ### PATCH Example
 * ```
 * // PATCH one of the heroes' name
 * patchHero (id: number, heroName: string): Observable<{}> {
 * const url = `${this.heroesUrl}/${id}`;   // PATCH api/heroes/42
 *  return this.httpClient.patch(url, {name: heroName}, httpOptions)
 *    .pipe(catchError(this.handleError('patchHero')));
 * }
 * ```
 *
 * @see [HTTP Guide](guide/http)
 * @see [HTTP Request](api/common/http/HttpRequest)
 *
 * @publicApi
 */
export declare class HttpClient {
    private handler;
    constructor(handler: HttpHandler);
    /**
     * Sends an `HttpRequest` and returns a stream of `HttpEvent`s.
     *
     * @return An `Observable` of the response, with the response body as a stream of `HttpEvent`s.
     */
    request<R>(req: HttpRequest<any>): Observable<HttpEvent<R>>;
    /**
     * Constructs a request that interprets the body as an `ArrayBuffer` and returns the response in
     * an `ArrayBuffer`.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     *
     * @return An `Observable` of the response, with the response body as an `ArrayBuffer`.
     */
    request(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<ArrayBuffer>;
    /**
     * Constructs a request that interprets the body as a blob and returns
     * the response as a blob.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body of type `Blob`.
     */
    request(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<Blob>;
    /**
     * Constructs a request that interprets the body as a text string and
     * returns a string value.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body of type string.
     */
    request(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<string>;
    /**
     * Constructs a request that interprets the body as an `ArrayBuffer` and returns the
     * the full event stream.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body as an array of `HttpEvent`s for
     * the request.
     */
    request(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        observe: 'events';
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpEvent<ArrayBuffer>>;
    /**
     * Constructs a request that interprets the body as a `Blob` and returns
     * the full event stream.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with the response body of type `Blob`.
     */
    request(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Blob>>;
    /**
     * Constructs a request which interprets the body as a text string and returns the full event
     * stream.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with the response body of type string.
     */
    request(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpEvent<string>>;
    /**
     * Constructs a request which interprets the body as a JSON object and returns the full event
     * stream.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the  request.
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with the response body of type `Object`.
     */
    request(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        reportProgress?: boolean;
        observe: 'events';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<any>>;
    /**
     * Constructs a request which interprets the body as a JSON object and returns the full event
     * stream.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with the response body of type `R`.
     */
    request<R>(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        reportProgress?: boolean;
        observe: 'events';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<R>>;
    /**
     * Constructs a request which interprets the body as an `ArrayBuffer`
     * and returns the full `HttpResponse`.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse`, with the response body as an `ArrayBuffer`.
     */
    request(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpResponse<ArrayBuffer>>;
    /**
     * Constructs a request which interprets the body as a `Blob` and returns the full `HttpResponse`.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse`, with the response body of type `Blob`.
     */
    request(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Blob>>;
    /**
     * Constructs a request which interprets the body as a text stream and returns the full
     * `HttpResponse`.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the HTTP response, with the response body of type string.
     */
    request(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpResponse<string>>;
    /**
     * Constructs a request which interprets the body as a JSON object and returns the full
     * `HttpResponse`.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the full `HttpResponse`,
     * with the response body of type `Object`.
     */
    request(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        reportProgress?: boolean;
        observe: 'response';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Object>>;
    /**
     * Constructs a request which interprets the body as a JSON object and returns
     * the full `HttpResponse` with the response body in the requested type.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return  An `Observable` of the full `HttpResponse`, with the response body of type `R`.
     */
    request<R>(method: string, url: string, options: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        reportProgress?: boolean;
        observe: 'response';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<R>>;
    /**
     * Constructs a request which interprets the body as a JSON object and returns the full
     * `HttpResponse` as a JSON object.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse`, with the response body of type `Object`.
     */
    request(method: string, url: string, options?: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        responseType?: 'json';
        reportProgress?: boolean;
        withCredentials?: boolean;
    }): Observable<Object>;
    /**
     * Constructs a request which interprets the body as a JSON object
     * with the response body of the requested type.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse`, with the response body of type `R`.
     */
    request<R>(method: string, url: string, options?: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        responseType?: 'json';
        reportProgress?: boolean;
        withCredentials?: boolean;
    }): Observable<R>;
    /**
     * Constructs a request where response type and requested observable are not known statically.
     *
     * @param method  The HTTP method.
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the requested response, with body of type `any`.
     */
    request(method: string, url: string, options?: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        observe?: 'body' | 'events' | 'response';
        reportProgress?: boolean;
        responseType?: 'arraybuffer' | 'blob' | 'json' | 'text';
        withCredentials?: boolean;
    }): Observable<any>;
    /**
     * Constructs a `DELETE` request that interprets the body as an `ArrayBuffer`
     *  and returns the response as an `ArrayBuffer`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return  An `Observable` of the response body as an `ArrayBuffer`.
     */
    delete(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<ArrayBuffer>;
    /**
     * Constructs a `DELETE` request that interprets the body as a `Blob` and returns
     * the response as a `Blob`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response body as a `Blob`.
     */
    delete(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<Blob>;
    /**
     * Constructs a `DELETE` request that interprets the body as a text string and returns
     * a string.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body of type string.
     */
    delete(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<string>;
    /**
     * Constructs a `DELETE` request that interprets the body as an `ArrayBuffer`
     *  and returns the full event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with response body as an `ArrayBuffer`.
     */
    delete(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<HttpEvent<ArrayBuffer>>;
    /**
     * Constructs a `DELETE` request that interprets the body as a `Blob`
     *  and returns the full event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all the `HttpEvent`s for the request, with the response body as a
     * `Blob`.
     */
    delete(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<HttpEvent<Blob>>;
    /**
     * Constructs a `DELETE` request that interprets the body as a text string
     * and returns the full event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all `HttpEvent`s for the request, with the response
     * body of type string.
     */
    delete(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<HttpEvent<string>>;
    /**
     * Constructs a `DELETE` request that interprets the body as a JSON object
     * and returns the full event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all `HttpEvent`s for the request, with response body of
     * type `Object`.
     */
    delete(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<HttpEvent<Object>>;
    /**
     * Constructs a `DELETE`request that interprets the body as a JSON object
     * and returns the full event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all the `HttpEvent`s for the request, with a response
     * body in the requested type.
     */
    delete<T>(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | (string | number | boolean)[];
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<HttpEvent<T>>;
    /**
     * Constructs a `DELETE` request that interprets the body as an `ArrayBuffer` and returns
     *  the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the full `HttpResponse`, with the response body as an `ArrayBuffer`.
     */
    delete(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<HttpResponse<ArrayBuffer>>;
    /**
     * Constructs a `DELETE` request that interprets the body as a `Blob` and returns the full
     * `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse`, with the response body of type `Blob`.
     */
    delete(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<HttpResponse<Blob>>;
    /**
     * Constructs a `DELETE` request that interprets the body as a text stream and
     *  returns the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the full `HttpResponse`, with the response body of type string.
     */
    delete(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<HttpResponse<string>>;
    /**
     * Constructs a `DELETE` request the interprets the body as a JSON object and returns
     * the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse`, with the response body of type `Object`.
     *
     */
    delete(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<HttpResponse<Object>>;
    /**
     * Constructs a `DELETE` request that interprets the body as a JSON object
     * and returns the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse`, with the response body of the requested type.
     */
    delete<T>(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<HttpResponse<T>>;
    /**
     * Constructs a `DELETE` request that interprets the body as a JSON object and
     * returns the response body as a JSON object.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body of type `Object`.
     */
    delete(url: string, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<Object>;
    /**
     * Constructs a DELETE request that interprets the body as a JSON object and returns
     * the response in a given type.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse`, with response body in the requested type.
     */
    delete<T>(url: string, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
        body?: any | null;
    }): Observable<T>;
    /**
     * Constructs a `GET` request that interprets the body as an `ArrayBuffer` and returns the
     * response in an `ArrayBuffer`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body as an `ArrayBuffer`.
     */
    get(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<ArrayBuffer>;
    /**
     * Constructs a `GET` request that interprets the body as a `Blob`
     * and returns the response as a `Blob`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body as a `Blob`.
     */
    get(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<Blob>;
    /**
     * Constructs a `GET` request that interprets the body as a text string
     * and returns the response as a string value.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body of type string.
     */
    get(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<string>;
    /**
     * Constructs a `GET` request that interprets the body as an `ArrayBuffer` and returns
     *  the full event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all `HttpEvent`s for the request, with the response
     * body as an `ArrayBuffer`.
     */
    get(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpEvent<ArrayBuffer>>;
    /**
     * Constructs a `GET` request that interprets the body as a `Blob` and
     * returns the full event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body as a `Blob`.
     */
    get(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Blob>>;
    /**
     * Constructs a `GET` request that interprets the body as a text string and returns
     * the full event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body of type string.
     */
    get(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpEvent<string>>;
    /**
     * Constructs a `GET` request that interprets the body as a JSON object
     * and returns the full event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body of type `Object`.
     */
    get(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Object>>;
    /**
     * Constructs a `GET` request that interprets the body as a JSON object and returns the full event
     * stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with a response body in the requested type.
     */
    get<T>(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<T>>;
    /**
     * Constructs a `GET` request that interprets the body as an `ArrayBuffer` and
     * returns the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body as an `ArrayBuffer`.
     */
    get(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpResponse<ArrayBuffer>>;
    /**
     * Constructs a `GET` request that interprets the body as a `Blob` and
     * returns the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body as a `Blob`.
     */
    get(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Blob>>;
    /**
     * Constructs a `GET` request that interprets the body as a text stream and
     * returns the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body of type string.
     */
    get(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpResponse<string>>;
    /**
     * Constructs a `GET` request that interprets the body as a JSON object and
     * returns the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the full `HttpResponse`,
     * with the response body of type `Object`.
     */
    get(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Object>>;
    /**
     * Constructs a `GET` request that interprets the body as a JSON object and
     * returns the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the full `HttpResponse` for the request,
     * with a response body in the requested type.
     */
    get<T>(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<T>>;
    /**
     * Constructs a `GET` request that interprets the body as a JSON object and
     * returns the response body as a JSON object.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     *
     * @return An `Observable` of the response body as a JSON object.
     */
    get(url: string, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<Object>;
    /**
     * Constructs a `GET` request that interprets the body as a JSON object and returns
     * the response body in a given type.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse`, with a response body in the requested type.
     */
    get<T>(url: string, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<T>;
    /**
     * Constructs a `HEAD` request that interprets the body as an `ArrayBuffer` and
     * returns the response as an `ArrayBuffer`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body as an `ArrayBuffer`.
     */
    head(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<ArrayBuffer>;
    /**
     * Constructs a `HEAD` request that interprets the body as a `Blob` and returns
     * the response as a `Blob`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return  An `Observable` of the response, with the response body as a `Blob`.
     */
    head(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<Blob>;
    /**
     * Constructs a `HEAD` request that interprets the body as a text string and returns the response
     * as a string value.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body of type string.
     */
    head(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<string>;
    /**
     * Constructs a `HEAD` request that interprets the body as an  `ArrayBuffer`
     *  and returns the full event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with the response body as an `ArrayBuffer`.
     */
    head(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpEvent<ArrayBuffer>>;
    /**
     * Constructs a `HEAD` request that interprets the body as a `Blob` and
     * returns the full event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with the response body as a `Blob`.
     */
    head(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Blob>>;
    /**
     * Constructs a `HEAD` request that interprets the body as a text string
     * and returns the full event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all `HttpEvent`s for the request, with the response body of type
     * string.
     */
    head(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpEvent<string>>;
    /**
     * Constructs a `HEAD` request that interprets the body as a JSON object
     * and returns the full HTTP event stream.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of all `HttpEvent`s for the request, with a response body of
     * type `Object`.
     */
    head(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Object>>;
    /**
     * Constructs a `HEAD` request that interprets the body as a JSON object and
     * returns the full event stream.
     *
     * @return An `Observable` of all the `HttpEvent`s for the request,
     * with a response body in the requested type.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     */
    head<T>(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<T>>;
    /**
     * Constructs a `HEAD` request that interprets the body as an `ArrayBuffer`
     *  and returns the full HTTP response.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body as an `ArrayBuffer`.
     */
    head(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpResponse<ArrayBuffer>>;
    /**
     * Constructs a `HEAD` request that interprets the body as a `Blob` and returns
     * the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body as a blob.
     */
    head(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Blob>>;
    /**
     * Constructs a `HEAD` request that interprets the body as text stream
     * and returns the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body of type string.
     */
    head(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpResponse<string>>;
    /**
     * Constructs a `HEAD` request that interprets the body as a JSON object and
     * returns the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body of type `Object`.
     */
    head(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Object>>;
    /**
     * Constructs a `HEAD` request that interprets the body as a JSON object
     * and returns the full `HttpResponse`.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with a response body of the requested type.
     */
    head<T>(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<T>>;
    /**
     * Constructs a `HEAD` request that interprets the body as a JSON object and
     * returns the response body as a JSON object.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the response, with the response body as a JSON object.
     */
    head(url: string, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<Object>;
    /**
     * Constructs a `HEAD` request that interprets the body as a JSON object and returns
     * the response in a given type.
     *
     * @param url     The endpoint URL.
     * @param options The HTTP options to send with the request.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with a response body of the given type.
     */
    head<T>(url: string, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<T>;
    /**
     * Constructs a `JSONP` request for the given URL and name of the callback parameter.
     *
     * @param url The resource URL.
     * @param callbackParam The callback function name.
     *
     * @return An `Observable` of the response object, with response body as an object.
     */
    jsonp(url: string, callbackParam: string): Observable<Object>;
    /**
     * Constructs a `JSONP` request for the given URL and name of the callback parameter.
     *
     * @param url The resource URL.
     * @param callbackParam The callback function name.
     *
     * You must install a suitable interceptor, such as one provided by `HttpClientJsonpModule`.
     * If no such interceptor is reached,
     * then the `JSONP` request can be rejected by the configured backend.
     *
     * @return An `Observable` of the response object, with response body in the requested type.
     */
    jsonp<T>(url: string, callbackParam: string): Observable<T>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as an
     * `ArrayBuffer` and returns the response as an `ArrayBuffer`.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of the response, with the response body as an `ArrayBuffer`.
     */
    options(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<ArrayBuffer>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as a `Blob` and returns
     * the response as a `Blob`.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of the response, with the response body as a `Blob`.
     */
    options(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<Blob>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as a text string and
     * returns a string value.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of the response, with the response body of type string.
     */
    options(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<string>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as an `ArrayBuffer`
     *  and returns the full event stream.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return  An `Observable` of all `HttpEvent`s for the request,
     * with the response body as an `ArrayBuffer`.
     */
    options(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpEvent<ArrayBuffer>>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as a `Blob` and
     * returns the full event stream.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with the response body as a `Blob`.
     */
    options(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Blob>>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as a text string
     * and returns the full event stream.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of all the `HttpEvent`s for the request,
     * with the response body of type string.
     */
    options(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpEvent<string>>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as a JSON object
     * and returns the full event stream.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of all the `HttpEvent`s for the request with the response
     * body of type `Object`.
     */
    options(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Object>>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as a JSON object and
     * returns the full event stream.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of all the `HttpEvent`s for the request,
     * with a response body in the requested type.
     */
    options<T>(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<T>>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as an `ArrayBuffer`
     *  and returns the full HTTP response.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body as an `ArrayBuffer`.
     */
    options(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpResponse<ArrayBuffer>>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as a `Blob`
     *  and returns the full `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body as a `Blob`.
     */
    options(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Blob>>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as text stream
     * and returns the full `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body of type string.
     */
    options(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpResponse<string>>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as a JSON object
     * and returns the full `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body of type `Object`.
     */
    options(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Object>>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as a JSON object and
     * returns the full `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with a response body in the requested type.
     */
    options<T>(url: string, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<T>>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as a JSON object and returns the
     * response body as a JSON object.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of the response, with the response body as a JSON object.
     */
    options(url: string, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<Object>;
    /**
     * Constructs an `OPTIONS` request that interprets the body as a JSON object and returns the
     * response in a given type.
     *
     * @param url The endpoint URL.
     * @param options HTTP options.
     *
     * @return An `Observable` of the `HttpResponse`, with a response body of the given type.
     */
    options<T>(url: string, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<T>;
    /**
     * Constructs a `PATCH` request that interprets the body as an `ArrayBuffer` and returns
     * the response as an `ArrayBuffer`.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return An `Observable` of the response, with the response body as an `ArrayBuffer`.
     */
    patch(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<ArrayBuffer>;
    /**
     * Constructs a `PATCH` request that interprets the body as a `Blob` and returns the response
     * as a `Blob`.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return An `Observable` of the response, with the response body as a `Blob`.
     */
    patch(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<Blob>;
    /**
     * Constructs a `PATCH` request that interprets the body as a text string and
     * returns the response as a string value.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return An `Observable` of the response, with a response body of type string.
     */
    patch(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<string>;
    /**
     * Constructs a `PATCH` request that interprets the body as an `ArrayBuffer` and
     *  returns the full event stream.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return An `Observable` of all the `HttpEvent`s for the request,
     * with the response body as an `ArrayBuffer`.
     */
    patch(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpEvent<ArrayBuffer>>;
    /**
     * Constructs a `PATCH` request that interprets the body as a `Blob`
     *  and returns the full event stream.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return An `Observable` of all the `HttpEvent`s for the request, with the
     * response body as `Blob`.
     */
    patch(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Blob>>;
    /**
     * Constructs a `PATCH` request that interprets the body as a text string and
     * returns the full event stream.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return An `Observable` of all the `HttpEvent`s for the request, with a
     * response body of type string.
     */
    patch(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpEvent<string>>;
    /**
     * Constructs a `PATCH` request that interprets the body as a JSON object
     * and returns the full event stream.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return An `Observable` of all the `HttpEvent`s for the request,
     * with a response body of type `Object`.
     */
    patch(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Object>>;
    /**
     * Constructs a `PATCH` request that interprets the body as a JSON object
     * and returns the full event stream.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return An `Observable` of all the `HttpEvent`s for the request,
     * with a response body in the requested type.
     */
    patch<T>(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<T>>;
    /**
     * Constructs a `PATCH` request that interprets the body as an `ArrayBuffer`
     *  and returns the full `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return  An `Observable` of the `HttpResponse` for the request,
     * with the response body as an `ArrayBuffer`.
     */
    patch(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpResponse<ArrayBuffer>>;
    /**
     * Constructs a `PATCH` request that interprets the body as a `Blob` and returns the full
     * `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return  An `Observable` of the `HttpResponse` for the request,
     * with the response body as a `Blob`.
     */
    patch(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Blob>>;
    /**
     * Constructs a `PATCH` request that interprets the body as a text stream and returns the
     * full `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return  An `Observable` of the `HttpResponse` for the request,
     * with a response body of type string.
     */
    patch(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpResponse<string>>;
    /**
     * Constructs a `PATCH` request that interprets the body as a JSON object
     * and returns the full `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with a response body in the requested type.
     */
    patch(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Object>>;
    /**
     * Constructs a `PATCH` request that interprets the body as a JSON object
     * and returns the full `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with a response body in the given type.
     */
    patch<T>(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<T>>;
    /**
     * Constructs a `PATCH` request that interprets the body as a JSON object and
     * returns the response body as a JSON object.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return An `Observable` of the response, with the response body as a JSON object.
     */
    patch(url: string, body: any | null, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<Object>;
    /**
     * Constructs a `PATCH` request that interprets the body as a JSON object
     * and returns the response in a given type.
     *
     * @param url The endpoint URL.
     * @param body The resources to edit.
     * @param options HTTP options.
     *
     * @return  An `Observable` of the `HttpResponse` for the request,
     * with a response body in the given type.
     */
    patch<T>(url: string, body: any | null, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<T>;
    /**
     * Constructs a `POST` request that interprets the body as an `ArrayBuffer` and returns
     * an `ArrayBuffer`.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options.
     *
     * @return An `Observable` of the response, with the response body as an `ArrayBuffer`.
     */
    post(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<ArrayBuffer>;
    /**
     * Constructs a `POST` request that interprets the body as a `Blob` and returns the
     * response as a `Blob`.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return An `Observable` of the response, with the response body as a `Blob`.
     */
    post(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<Blob>;
    /**
     * Constructs a `POST` request that interprets the body as a text string and
     * returns the response as a string value.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return An `Observable` of the response, with a response body of type string.
     */
    post(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<string>;
    /**
     * Constructs a `POST` request that interprets the body as an `ArrayBuffer` and
     * returns the full event stream.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with the response body as an `ArrayBuffer`.
     */
    post(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpEvent<ArrayBuffer>>;
    /**
     * Constructs a `POST` request that interprets the body as a `Blob`
     * and returns the response in an observable of the full event stream.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return An `Observable` of all `HttpEvent`s for the request, with the response body as `Blob`.
     */
    post(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Blob>>;
    /**
     * Constructs a `POST` request that interprets the body as a text string and returns the full
     * event stream.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return  An `Observable` of all `HttpEvent`s for the request,
     * with a response body of type string.
     */
    post(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpEvent<string>>;
    /**
     * Constructs a POST request that interprets the body as a JSON object and returns the full event
     * stream.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return  An `Observable` of all `HttpEvent`s for the request,
     * with a response body of type `Object`.
     */
    post(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Object>>;
    /**
     * Constructs a POST request that interprets the body as a JSON object and returns the full event
     * stream.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with a response body in the requested type.
     */
    post<T>(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<T>>;
    /**
     * Constructs a POST request that interprets the body as an `ArrayBuffer`
     *  and returns the full `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return  An `Observable` of the `HttpResponse` for the request, with the response body as an
     * `ArrayBuffer`.
     */
    post(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpResponse<ArrayBuffer>>;
    /**
     * Constructs a `POST` request that interprets the body as a `Blob` and returns the full
     * `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body as a `Blob`.
     */
    post(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Blob>>;
    /**
     * Constructs a `POST` request that interprets the body as a text stream and returns
     * the full `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return  An `Observable` of the `HttpResponse` for the request,
     * with a response body of type string.
     */
    post(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpResponse<string>>;
    /**
     * Constructs a `POST` request that interprets the body as a JSON object
     * and returns the full `HttpResponse`.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return An `Observable` of the `HttpResponse` for the request, with a response body of type
     * `Object`.
     */
    post(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Object>>;
    /**
     * Constructs a `POST` request that interprets the body as a JSON object and returns the full
     * `HttpResponse`.
     *
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return An `Observable` of the `HttpResponse` for the request, with a response body in the
     * requested type.
     */
    post<T>(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<T>>;
    /**
     * Constructs a `POST` request that interprets the body as a
     * JSON object and returns the response body as a JSON object.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return An `Observable` of the response, with the response body as a JSON object.
     */
    post(url: string, body: any | null, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<Object>;
    /**
     * Constructs a `POST` request that interprets the body as a JSON object
     * and returns an observable of the response.
     *
     * @param url The endpoint URL.
     * @param body The content to replace with.
     * @param options HTTP options
     *
     * @return  An `Observable` of the `HttpResponse` for the request, with a response body in the
     * requested type.
     */
    post<T>(url: string, body: any | null, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<T>;
    /**
     * Constructs a `PUT` request that interprets the body as an `ArrayBuffer` and returns the
     * response as an `ArrayBuffer`.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of the response, with the response body as an `ArrayBuffer`.
     */
    put(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<ArrayBuffer>;
    /**
     * Constructs a `PUT` request that interprets the body as a `Blob` and returns
     * the response as a `Blob`.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of the response, with the response body as a `Blob`.
     */
    put(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<Blob>;
    /**
     * Constructs a `PUT` request that interprets the body as a text string and
     * returns the response as a string value.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of the response, with a response body of type string.
     */
    put(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<string>;
    /**
     * Constructs a `PUT` request that interprets the body as an `ArrayBuffer` and
     * returns the full event stream.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with the response body as an `ArrayBuffer`.
     */
    put(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpEvent<ArrayBuffer>>;
    /**
     * Constructs a `PUT` request that interprets the body as a `Blob` and returns the full event
     * stream.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with the response body as a `Blob`.
     */
    put(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Blob>>;
    /**
     * Constructs a `PUT` request that interprets the body as a text string and returns the full event
     * stream.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of all `HttpEvent`s for the request, with a response body
     * of type string.
     */
    put(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpEvent<string>>;
    /**
     * Constructs a `PUT` request that interprets the body as a JSON object and returns the full event
     * stream.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of all `HttpEvent`s for the request, with a response body of
     * type `Object`.
     */
    put(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<Object>>;
    /**
     * Constructs a `PUT` request that interprets the body as a JSON object and returns the
     * full event stream.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of all `HttpEvent`s for the request,
     * with a response body in the requested type.
     */
    put<T>(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'events';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpEvent<T>>;
    /**
     * Constructs a `PUT` request that interprets the body as an
     * `ArrayBuffer` and returns an observable of the full HTTP response.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of the `HttpResponse` for the request, with the response body as an
     * `ArrayBuffer`.
     */
    put(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'arraybuffer';
        withCredentials?: boolean;
    }): Observable<HttpResponse<ArrayBuffer>>;
    /**
     * Constructs a `PUT` request that interprets the body as a `Blob` and returns the
     * full HTTP response.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with the response body as a `Blob`.
     */
    put(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'blob';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Blob>>;
    /**
     * Constructs a `PUT` request that interprets the body as a text stream and returns the
     * full HTTP response.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of the `HttpResponse` for the request, with a response body of type
     * string.
     */
    put(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType: 'text';
        withCredentials?: boolean;
    }): Observable<HttpResponse<string>>;
    /**
     * Constructs a `PUT` request that interprets the body as a JSON object and returns the full HTTP
     * response.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of the `HttpResponse` for the request, with a response body
     * of type 'Object`.
     */
    put(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<Object>>;
    /**
     * Constructs a `PUT` request that interprets the body as an instance of the requested type and
     * returns the full HTTP response.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of the `HttpResponse` for the request,
     * with a response body in the requested type.
     */
    put<T>(url: string, body: any | null, options: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe: 'response';
        context?: HttpContext;
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<HttpResponse<T>>;
    /**
     * Constructs a `PUT` request that interprets the body as a JSON object
     * and returns an observable of JSON object.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of the response as a JSON object.
     */
    put(url: string, body: any | null, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<Object>;
    /**
     * Constructs a `PUT` request that interprets the body as an instance of the requested type
     * and returns an observable of the requested type.
     *
     * @param url The endpoint URL.
     * @param body The resources to add/update.
     * @param options HTTP options
     *
     * @return An `Observable` of the requested type.
     */
    put<T>(url: string, body: any | null, options?: {
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        context?: HttpContext;
        observe?: 'body';
        params?: HttpParams | {
            [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
        };
        reportProgress?: boolean;
        responseType?: 'json';
        withCredentials?: boolean;
    }): Observable<T>;
    static ɵfac: ɵngcc0.ɵɵFactoryDeclaration<HttpClient, never>;
    static ɵprov: ɵngcc0.ɵɵInjectableDeclaration<HttpClient>;
}

/**
 * Configures the [dependency injector](guide/glossary#injector) for `HttpClient`
 * with supporting services for JSONP.
 * Without this module, Jsonp requests reach the backend
 * with method JSONP, where they are rejected.
 *
 * You can add interceptors to the chain behind `HttpClient` by binding them to the
 * multiprovider for built-in [DI token](guide/glossary#di-token) `HTTP_INTERCEPTORS`.
 *
 * @publicApi
 */
export declare class HttpClientJsonpModule {
    static ɵfac: ɵngcc0.ɵɵFactoryDeclaration<HttpClientJsonpModule, never>;
    static ɵmod: ɵngcc0.ɵɵNgModuleDeclaration<HttpClientJsonpModule, never, never, never>;
    static ɵinj: ɵngcc0.ɵɵInjectorDeclaration<HttpClientJsonpModule>;
}

/**
 * Configures the [dependency injector](guide/glossary#injector) for `HttpClient`
 * with supporting services for XSRF. Automatically imported by `HttpClientModule`.
 *
 * You can add interceptors to the chain behind `HttpClient` by binding them to the
 * multiprovider for built-in [DI token](guide/glossary#di-token) `HTTP_INTERCEPTORS`.
 *
 * @publicApi
 */
export declare class HttpClientModule {
    static ɵfac: ɵngcc0.ɵɵFactoryDeclaration<HttpClientModule, never>;
    static ɵmod: ɵngcc0.ɵɵNgModuleDeclaration<HttpClientModule, never, [typeof HttpClientXsrfModule], never>;
    static ɵinj: ɵngcc0.ɵɵInjectorDeclaration<HttpClientModule>;
}

/**
 * Configures XSRF protection support for outgoing requests.
 *
 * For a server that supports a cookie-based XSRF protection system,
 * use directly to configure XSRF protection with the correct
 * cookie and header names.
 *
 * If no names are supplied, the default cookie name is `XSRF-TOKEN`
 * and the default header name is `X-XSRF-TOKEN`.
 *
 * @publicApi
 */
export declare class HttpClientXsrfModule {
    /**
     * Disable the default XSRF protection.
     */
    static disable(): ModuleWithProviders<HttpClientXsrfModule>;
    /**
     * Configure XSRF protection.
     * @param options An object that can specify either or both
     * cookie name or header name.
     * - Cookie name default is `XSRF-TOKEN`.
     * - Header name default is `X-XSRF-TOKEN`.
     *
     */
    static withOptions(options?: {
        cookieName?: string;
        headerName?: string;
    }): ModuleWithProviders<HttpClientXsrfModule>;
    static ɵfac: ɵngcc0.ɵɵFactoryDeclaration<HttpClientXsrfModule, never>;
    static ɵmod: ɵngcc0.ɵɵNgModuleDeclaration<HttpClientXsrfModule, never, never, never>;
    static ɵinj: ɵngcc0.ɵɵInjectorDeclaration<HttpClientXsrfModule>;
}

/**
 * Http context stores arbitrary user defined values and ensures type safety without
 * actually knowing the types. It is backed by a `Map` and guarantees that keys do not clash.
 *
 * This context is mutable and is shared between cloned requests unless explicitly specified.
 *
 * @usageNotes
 *
 * ### Usage Example
 *
 * ```typescript
 * // inside cache.interceptors.ts
 * export const IS_CACHE_ENABLED = new HttpContextToken<boolean>(() => false);
 *
 * export class CacheInterceptor implements HttpInterceptor {
 *
 *   intercept(req: HttpRequest<any>, delegate: HttpHandler): Observable<HttpEvent<any>> {
 *     if (req.context.get(IS_CACHE_ENABLED) === true) {
 *       return ...;
 *     }
 *     return delegate.handle(req);
 *   }
 * }
 *
 * // inside a service
 *
 * this.httpClient.get('/api/weather', {
 *   context: new HttpContext().set(IS_CACHE_ENABLED, true)
 * }).subscribe(...);
 * ```
 *
 * @publicApi
 */
export declare class HttpContext {
    private readonly map;
    /**
     * Store a value in the context. If a value is already present it will be overwritten.
     *
     * @param token The reference to an instance of `HttpContextToken`.
     * @param value The value to store.
     *
     * @returns A reference to itself for easy chaining.
     */
    set<T>(token: HttpContextToken<T>, value: T): HttpContext;
    /**
     * Retrieve the value associated with the given token.
     *
     * @param token The reference to an instance of `HttpContextToken`.
     *
     * @returns The stored value or default if one is defined.
     */
    get<T>(token: HttpContextToken<T>): T;
    /**
     * Delete the value associated with the given token.
     *
     * @param token The reference to an instance of `HttpContextToken`.
     *
     * @returns A reference to itself for easy chaining.
     */
    delete(token: HttpContextToken<unknown>): HttpContext;
    /**
     * @returns a list of tokens currently stored in the context.
     */
    keys(): IterableIterator<HttpContextToken<unknown>>;
}


/**
 * A token used to manipulate and access values stored in `HttpContext`.
 *
 * @publicApi
 */
export declare class HttpContextToken<T> {
    readonly defaultValue: () => T;
    constructor(defaultValue: () => T);
}

/**
 * A download progress event.
 *
 * @publicApi
 */
export declare interface HttpDownloadProgressEvent extends HttpProgressEvent {
    type: HttpEventType.DownloadProgress;
    /**
     * The partial response body as downloaded so far.
     *
     * Only present if the responseType was `text`.
     */
    partialText?: string;
}

/**
 * A response that represents an error or failure, either from a
 * non-successful HTTP status, an error while executing the request,
 * or some other failure which occurred during the parsing of the response.
 *
 * Any error returned on the `Observable` response stream will be
 * wrapped in an `HttpErrorResponse` to provide additional context about
 * the state of the HTTP layer when the error occurred. The error property
 * will contain either a wrapped Error object or the error response returned
 * from the server.
 *
 * @publicApi
 */
export declare class HttpErrorResponse extends HttpResponseBase implements Error {
    readonly name = "HttpErrorResponse";
    readonly message: string;
    readonly error: any | null;
    /**
     * Errors are never okay, even when the status code is in the 2xx success range.
     */
    readonly ok = false;
    constructor(init: {
        error?: any;
        headers?: HttpHeaders;
        status?: number;
        statusText?: string;
        url?: string;
    });
}

/**
 * Union type for all possible events on the response stream.
 *
 * Typed according to the expected type of the response.
 *
 * @publicApi
 */
export declare type HttpEvent<T> = HttpSentEvent | HttpHeaderResponse | HttpResponse<T> | HttpProgressEvent | HttpUserEvent<T>;

/**
 * Type enumeration for the different kinds of `HttpEvent`.
 *
 * @publicApi
 */
export declare enum HttpEventType {
    /**
     * The request was sent out over the wire.
     */
    Sent = 0,
    /**
     * An upload progress event was received.
     */
    UploadProgress = 1,
    /**
     * The response status code and headers were received.
     */
    ResponseHeader = 2,
    /**
     * A download progress event was received.
     */
    DownloadProgress = 3,
    /**
     * The full response including the body was received.
     */
    Response = 4,
    /**
     * A custom event from an interceptor or a backend.
     */
    User = 5
}

/**
 * Transforms an `HttpRequest` into a stream of `HttpEvent`s, one of which will likely be a
 * `HttpResponse`.
 *
 * `HttpHandler` is injectable. When injected, the handler instance dispatches requests to the
 * first interceptor in the chain, which dispatches to the second, etc, eventually reaching the
 * `HttpBackend`.
 *
 * In an `HttpInterceptor`, the `HttpHandler` parameter is the next interceptor in the chain.
 *
 * @publicApi
 */
export declare abstract class HttpHandler {
    abstract handle(req: HttpRequest<any>): Observable<HttpEvent<any>>;
}

/**
 * A partial HTTP response which only includes the status and header data,
 * but no response body.
 *
 * `HttpHeaderResponse` is a `HttpEvent` available on the response
 * event stream, only when progress events are requested.
 *
 * @publicApi
 */
export declare class HttpHeaderResponse extends HttpResponseBase {
    /**
     * Create a new `HttpHeaderResponse` with the given parameters.
     */
    constructor(init?: {
        headers?: HttpHeaders;
        status?: number;
        statusText?: string;
        url?: string;
    });
    readonly type: HttpEventType.ResponseHeader;
    /**
     * Copy this `HttpHeaderResponse`, overriding its contents with the
     * given parameter hash.
     */
    clone(update?: {
        headers?: HttpHeaders;
        status?: number;
        statusText?: string;
        url?: string;
    }): HttpHeaderResponse;
}


/**
 * Represents the header configuration options for an HTTP request.
 * Instances are immutable. Modifying methods return a cloned
 * instance with the change. The original object is never changed.
 *
 * @publicApi
 */
export declare class HttpHeaders {
    /**
     * Internal map of lowercase header names to values.
     */
    private headers;
    /**
     * Internal map of lowercased header names to the normalized
     * form of the name (the form seen first).
     */
    private normalizedNames;
    /**
     * Complete the lazy initialization of this object (needed before reading).
     */
    private lazyInit;
    /**
     * Queued updates to be materialized the next initialization.
     */
    private lazyUpdate;
    /**  Constructs a new HTTP header object with the given values.*/
    constructor(headers?: string | {
        [name: string]: string | string[];
    });
    /**
     * Checks for existence of a given header.
     *
     * @param name The header name to check for existence.
     *
     * @returns True if the header exists, false otherwise.
     */
    has(name: string): boolean;
    /**
     * Retrieves the first value of a given header.
     *
     * @param name The header name.
     *
     * @returns The value string if the header exists, null otherwise
     */
    get(name: string): string | null;
    /**
     * Retrieves the names of the headers.
     *
     * @returns A list of header names.
     */
    keys(): string[];
    /**
     * Retrieves a list of values for a given header.
     *
     * @param name The header name from which to retrieve values.
     *
     * @returns A string of values if the header exists, null otherwise.
     */
    getAll(name: string): string[] | null;
    /**
     * Appends a new value to the existing set of values for a header
     * and returns them in a clone of the original instance.
     *
     * @param name The header name for which to append the values.
     * @param value The value to append.
     *
     * @returns A clone of the HTTP headers object with the value appended to the given header.
     */
    append(name: string, value: string | string[]): HttpHeaders;
    /**
     * Sets or modifies a value for a given header in a clone of the original instance.
     * If the header already exists, its value is replaced with the given value
     * in the returned object.
     *
     * @param name The header name.
     * @param value The value or values to set or overide for the given header.
     *
     * @returns A clone of the HTTP headers object with the newly set header value.
     */
    set(name: string, value: string | string[]): HttpHeaders;
    /**
     * Deletes values for a given header in a clone of the original instance.
     *
     * @param name The header name.
     * @param value The value or values to delete for the given header.
     *
     * @returns A clone of the HTTP headers object with the given value deleted.
     */
    delete(name: string, value?: string | string[]): HttpHeaders;
    private maybeSetNormalizedName;
    private init;
    private copyFrom;
    private clone;
    private applyUpdate;
}

/**
 * Intercepts and handles an `HttpRequest` or `HttpResponse`.
 *
 * Most interceptors transform the outgoing request before passing it to the
 * next interceptor in the chain, by calling `next.handle(transformedReq)`.
 * An interceptor may transform the
 * response event stream as well, by applying additional RxJS operators on the stream
 * returned by `next.handle()`.
 *
 * More rarely, an interceptor may handle the request entirely,
 * and compose a new event stream instead of invoking `next.handle()`. This is an
 * acceptable behavior, but keep in mind that further interceptors will be skipped entirely.
 *
 * It is also rare but valid for an interceptor to return multiple responses on the
 * event stream for a single request.
 *
 * @publicApi
 *
 * @see [HTTP Guide](guide/http#intercepting-requests-and-responses)
 *
 * @usageNotes
 *
 * To use the same instance of `HttpInterceptors` for the entire app, import the `HttpClientModule`
 * only in your `AppModule`, and add the interceptors to the root application injector.
 * If you import `HttpClientModule` multiple times across different modules (for example, in lazy
 * loading modules), each import creates a new copy of the `HttpClientModule`, which overwrites the
 * interceptors provided in the root module.
 *
 */
export declare interface HttpInterceptor {
    /**
     * Identifies and handles a given HTTP request.
     * @param req The outgoing request object to handle.
     * @param next The next interceptor in the chain, or the backend
     * if no interceptors remain in the chain.
     * @returns An observable of the event stream.
     */
    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>;
}


/**
 * A codec for encoding and decoding parameters in URLs.
 *
 * Used by `HttpParams`.
 *
 * @publicApi
 **/
export declare interface HttpParameterCodec {
    encodeKey(key: string): string;
    encodeValue(value: string): string;
    decodeKey(key: string): string;
    decodeValue(value: string): string;
}

/**
 * An HTTP request/response body that represents serialized parameters,
 * per the MIME type `application/x-www-form-urlencoded`.
 *
 * This class is immutable; all mutation operations return a new instance.
 *
 * @publicApi
 */
export declare class HttpParams {
    private map;
    private encoder;
    private updates;
    private cloneFrom;
    constructor(options?: HttpParamsOptions);
    /**
     * Reports whether the body includes one or more values for a given parameter.
     * @param param The parameter name.
     * @returns True if the parameter has one or more values,
     * false if it has no value or is not present.
     */
    has(param: string): boolean;
    /**
     * Retrieves the first value for a parameter.
     * @param param The parameter name.
     * @returns The first value of the given parameter,
     * or `null` if the parameter is not present.
     */
    get(param: string): string | null;
    /**
     * Retrieves all values for a  parameter.
     * @param param The parameter name.
     * @returns All values in a string array,
     * or `null` if the parameter not present.
     */
    getAll(param: string): string[] | null;
    /**
     * Retrieves all the parameters for this body.
     * @returns The parameter names in a string array.
     */
    keys(): string[];
    /**
     * Appends a new value to existing values for a parameter.
     * @param param The parameter name.
     * @param value The new value to add.
     * @return A new body with the appended value.
     */
    append(param: string, value: string | number | boolean): HttpParams;
    /**
     * Constructs a new body with appended values for the given parameter name.
     * @param params parameters and values
     * @return A new body with the new value.
     */
    appendAll(params: {
        [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
    }): HttpParams;
    /**
     * Replaces the value for a parameter.
     * @param param The parameter name.
     * @param value The new value.
     * @return A new body with the new value.
     */
    set(param: string, value: string | number | boolean): HttpParams;
    /**
     * Removes a given value or all values from a parameter.
     * @param param The parameter name.
     * @param value The value to remove, if provided.
     * @return A new body with the given value removed, or with all values
     * removed if no value is specified.
     */
    delete(param: string, value?: string | number | boolean): HttpParams;
    /**
     * Serializes the body to an encoded string, where key-value pairs (separated by `=`) are
     * separated by `&`s.
     */
    toString(): string;
    private clone;
    private init;
}

/**
 * Options used to construct an `HttpParams` instance.
 *
 * @publicApi
 */
export declare interface HttpParamsOptions {
    /**
     * String representation of the HTTP parameters in URL-query-string format.
     * Mutually exclusive with `fromObject`.
     */
    fromString?: string;
    /** Object map of the HTTP parameters. Mutually exclusive with `fromString`. */
    fromObject?: {
        [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
    };
    /** Encoding codec used to parse and serialize the parameters. */
    encoder?: HttpParameterCodec;
}

/**
 * Base interface for progress events.
 *
 * @publicApi
 */
export declare interface HttpProgressEvent {
    /**
     * Progress event type is either upload or download.
     */
    type: HttpEventType.DownloadProgress | HttpEventType.UploadProgress;
    /**
     * Number of bytes uploaded or downloaded.
     */
    loaded: number;
    /**
     * Total number of bytes to upload or download. Depending on the request or
     * response, this may not be computable and thus may not be present.
     */
    total?: number;
}

/**
 * An outgoing HTTP request with an optional typed body.
 *
 * `HttpRequest` represents an outgoing request, including URL, method,
 * headers, body, and other request configuration options. Instances should be
 * assumed to be immutable. To modify a `HttpRequest`, the `clone`
 * method should be used.
 *
 * @publicApi
 */
export declare class HttpRequest<T> {
    readonly url: string;
    /**
     * The request body, or `null` if one isn't set.
     *
     * Bodies are not enforced to be immutable, as they can include a reference to any
     * user-defined data type. However, interceptors should take care to preserve
     * idempotence by treating them as such.
     */
    readonly body: T | null;
    /**
     * Outgoing headers for this request.
     */
    readonly headers: HttpHeaders;
    /**
     * Shared and mutable context that can be used by interceptors
     */
    readonly context: HttpContext;
    /**
     * Whether this request should be made in a way that exposes progress events.
     *
     * Progress events are expensive (change detection runs on each event) and so
     * they should only be requested if the consumer intends to monitor them.
     */
    readonly reportProgress: boolean;
    /**
     * Whether this request should be sent with outgoing credentials (cookies).
     */
    readonly withCredentials: boolean;
    /**
     * The expected response type of the server.
     *
     * This is used to parse the response appropriately before returning it to
     * the requestee.
     */
    readonly responseType: 'arraybuffer' | 'blob' | 'json' | 'text';
    /**
     * The outgoing HTTP request method.
     */
    readonly method: string;
    /**
     * Outgoing URL parameters.
     *
     * To pass a string representation of HTTP parameters in the URL-query-string format,
     * the `HttpParamsOptions`' `fromString` may be used. For example:
     *
     * ```
     * new HttpParams({fromString: 'angular=awesome'})
     * ```
     */
    readonly params: HttpParams;
    /**
     * The outgoing URL with all URL parameters set.
     */
    readonly urlWithParams: string;
    constructor(method: 'DELETE' | 'GET' | 'HEAD' | 'JSONP' | 'OPTIONS', url: string, init?: {
        headers?: HttpHeaders;
        context?: HttpContext;
        reportProgress?: boolean;
        params?: HttpParams;
        responseType?: 'arraybuffer' | 'blob' | 'json' | 'text';
        withCredentials?: boolean;
    });
    constructor(method: 'POST' | 'PUT' | 'PATCH', url: string, body: T | null, init?: {
        headers?: HttpHeaders;
        context?: HttpContext;
        reportProgress?: boolean;
        params?: HttpParams;
        responseType?: 'arraybuffer' | 'blob' | 'json' | 'text';
        withCredentials?: boolean;
    });
    constructor(method: string, url: string, body: T | null, init?: {
        headers?: HttpHeaders;
        context?: HttpContext;
        reportProgress?: boolean;
        params?: HttpParams;
        responseType?: 'arraybuffer' | 'blob' | 'json' | 'text';
        withCredentials?: boolean;
    });
    /**
     * Transform the free-form body into a serialized format suitable for
     * transmission to the server.
     */
    serializeBody(): ArrayBuffer | Blob | FormData | string | null;
    /**
     * Examine the body and attempt to infer an appropriate MIME type
     * for it.
     *
     * If no such type can be inferred, this method will return `null`.
     */
    detectContentTypeHeader(): string | null;
    clone(): HttpRequest<T>;
    clone(update: {
        headers?: HttpHeaders;
        context?: HttpContext;
        reportProgress?: boolean;
        params?: HttpParams;
        responseType?: 'arraybuffer' | 'blob' | 'json' | 'text';
        withCredentials?: boolean;
        body?: T | null;
        method?: string;
        url?: string;
        setHeaders?: {
            [name: string]: string | string[];
        };
        setParams?: {
            [param: string]: string;
        };
    }): HttpRequest<T>;
    clone<V>(update: {
        headers?: HttpHeaders;
        context?: HttpContext;
        reportProgress?: boolean;
        params?: HttpParams;
        responseType?: 'arraybuffer' | 'blob' | 'json' | 'text';
        withCredentials?: boolean;
        body?: V | null;
        method?: string;
        url?: string;
        setHeaders?: {
            [name: string]: string | string[];
        };
        setParams?: {
            [param: string]: string;
        };
    }): HttpRequest<V>;
}

/**
 * A full HTTP response, including a typed response body (which may be `null`
 * if one was not returned).
 *
 * `HttpResponse` is a `HttpEvent` available on the response event
 * stream.
 *
 * @publicApi
 */
export declare class HttpResponse<T> extends HttpResponseBase {
    /**
     * The response body, or `null` if one was not returned.
     */
    readonly body: T | null;
    /**
     * Construct a new `HttpResponse`.
     */
    constructor(init?: {
        body?: T | null;
        headers?: HttpHeaders;
        status?: number;
        statusText?: string;
        url?: string;
    });
    readonly type: HttpEventType.Response;
    clone(): HttpResponse<T>;
    clone(update: {
        headers?: HttpHeaders;
        status?: number;
        statusText?: string;
        url?: string;
    }): HttpResponse<T>;
    clone<V>(update: {
        body?: V | null;
        headers?: HttpHeaders;
        status?: number;
        statusText?: string;
        url?: string;
    }): HttpResponse<V>;
}

/**
 * Base class for both `HttpResponse` and `HttpHeaderResponse`.
 *
 * @publicApi
 */
export declare abstract class HttpResponseBase {
    /**
     * All response headers.
     */
    readonly headers: HttpHeaders;
    /**
     * Response status code.
     */
    readonly status: number;
    /**
     * Textual description of response status code, defaults to OK.
     *
     * Do not depend on this.
     */
    readonly statusText: string;
    /**
     * URL of the resource retrieved, or null if not available.
     */
    readonly url: string | null;
    /**
     * Whether the status code falls in the 2xx range.
     */
    readonly ok: boolean;
    /**
     * Type of the response, narrowed to either the full response or the header.
     */
    readonly type: HttpEventType.Response | HttpEventType.ResponseHeader;
    /**
     * Super-constructor for all responses.
     *
     * The single parameter accepted is an initialization hash. Any properties
     * of the response passed there will override the default values.
     */
    constructor(init: {
        headers?: HttpHeaders;
        status?: number;
        statusText?: string;
        url?: string;
    }, defaultStatus?: number, defaultStatusText?: string);
}

/**
 * An event indicating that the request was sent to the server. Useful
 * when a request may be retried multiple times, to distinguish between
 * retries on the final event stream.
 *
 * @publicApi
 */
export declare interface HttpSentEvent {
    type: HttpEventType.Sent;
}

/**
 * Http status codes.
 * As per https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
 * @publicApi
 */
export declare const enum HttpStatusCode {
    Continue = 100,
    SwitchingProtocols = 101,
    Processing = 102,
    EarlyHints = 103,
    Ok = 200,
    Created = 201,
    Accepted = 202,
    NonAuthoritativeInformation = 203,
    NoContent = 204,
    ResetContent = 205,
    PartialContent = 206,
    MultiStatus = 207,
    AlreadyReported = 208,
    ImUsed = 226,
    MultipleChoices = 300,
    MovedPermanently = 301,
    Found = 302,
    SeeOther = 303,
    NotModified = 304,
    UseProxy = 305,
    Unused = 306,
    TemporaryRedirect = 307,
    PermanentRedirect = 308,
    BadRequest = 400,
    Unauthorized = 401,
    PaymentRequired = 402,
    Forbidden = 403,
    NotFound = 404,
    MethodNotAllowed = 405,
    NotAcceptable = 406,
    ProxyAuthenticationRequired = 407,
    RequestTimeout = 408,
    Conflict = 409,
    Gone = 410,
    LengthRequired = 411,
    PreconditionFailed = 412,
    PayloadTooLarge = 413,
    UriTooLong = 414,
    UnsupportedMediaType = 415,
    RangeNotSatisfiable = 416,
    ExpectationFailed = 417,
    ImATeapot = 418,
    MisdirectedRequest = 421,
    UnprocessableEntity = 422,
    Locked = 423,
    FailedDependency = 424,
    TooEarly = 425,
    UpgradeRequired = 426,
    PreconditionRequired = 428,
    TooManyRequests = 429,
    RequestHeaderFieldsTooLarge = 431,
    UnavailableForLegalReasons = 451,
    InternalServerError = 500,
    NotImplemented = 501,
    BadGateway = 502,
    ServiceUnavailable = 503,
    GatewayTimeout = 504,
    HttpVersionNotSupported = 505,
    VariantAlsoNegotiates = 506,
    InsufficientStorage = 507,
    LoopDetected = 508,
    NotExtended = 510,
    NetworkAuthenticationRequired = 511
}

/**
 * An upload progress event.
 *
 * @publicApi
 */
export declare interface HttpUploadProgressEvent extends HttpProgressEvent {
    type: HttpEventType.UploadProgress;
}

/**
 * Provides encoding and decoding of URL parameter and query-string values.
 *
 * Serializes and parses URL parameter keys and values to encode and decode them.
 * If you pass URL query parameters without encoding,
 * the query parameters can be misinterpreted at the receiving end.
 *
 *
 * @publicApi
 */
export declare class HttpUrlEncodingCodec implements HttpParameterCodec {
    /**
     * Encodes a key name for a URL parameter or query-string.
     * @param key The key name.
     * @returns The encoded key name.
     */
    encodeKey(key: string): string;
    /**
     * Encodes the value of a URL parameter or query-string.
     * @param value The value.
     * @returns The encoded value.
     */
    encodeValue(value: string): string;
    /**
     * Decodes an encoded URL parameter or query-string key.
     * @param key The encoded key name.
     * @returns The decoded key name.
     */
    decodeKey(key: string): string;
    /**
     * Decodes an encoded URL parameter or query-string value.
     * @param value The encoded value.
     * @returns The decoded value.
     */
    decodeValue(value: string): string;
}

/**
 * A user-defined event.
 *
 * Grouping all custom events under this type ensures they will be handled
 * and forwarded by all implementations of interceptors.
 *
 * @publicApi
 */
export declare interface HttpUserEvent<T> {
    type: HttpEventType.User;
}

/**
 * Uses `XMLHttpRequest` to send requests to a backend server.
 * @see `HttpHandler`
 * @see `JsonpClientBackend`
 *
 * @publicApi
 */
export declare class HttpXhrBackend implements HttpBackend {
    private xhrFactory;
    constructor(xhrFactory: XhrFactory_2);
    /**
     * Processes a request and returns a stream of response events.
     * @param req The request object.
     * @returns An observable of the response events.
     */
    handle(req: HttpRequest<any>): Observable<HttpEvent<any>>;
    static ɵfac: ɵngcc0.ɵɵFactoryDeclaration<HttpXhrBackend, never>;
    static ɵprov: ɵngcc0.ɵɵInjectableDeclaration<HttpXhrBackend>;
}

/**
 * Retrieves the current XSRF token to use with the next outgoing request.
 *
 * @publicApi
 */
export declare abstract class HttpXsrfTokenExtractor {
    /**
     * Get the XSRF token to use with an outgoing request.
     *
     * Will be called for every request, so the token may change between requests.
     */
    abstract getToken(): string | null;
}

/**
 * Processes an `HttpRequest` with the JSONP method,
 * by performing JSONP style requests.
 * @see `HttpHandler`
 * @see `HttpXhrBackend`
 *
 * @publicApi
 */
export declare class JsonpClientBackend implements HttpBackend {
    private callbackMap;
    private document;
    /**
     * A resolved promise that can be used to schedule microtasks in the event handlers.
     */
    private readonly resolvedPromise;
    constructor(callbackMap: ɵangular_packages_common_http_http_b, document: any);
    /**
     * Get the name of the next callback method, by incrementing the global `nextRequestId`.
     */
    private nextCallback;
    /**
     * Processes a JSONP request and returns an event stream of the results.
     * @param req The request object.
     * @returns An observable of the response events.
     *
     */
    handle(req: HttpRequest<never>): Observable<HttpEvent<any>>;
    static ɵfac: ɵngcc0.ɵɵFactoryDeclaration<JsonpClientBackend, never>;
    static ɵprov: ɵngcc0.ɵɵInjectableDeclaration<JsonpClientBackend>;
}

/**
 * Identifies requests with the method JSONP and
 * shifts them to the `JsonpClientBackend`.
 *
 * @see `HttpInterceptor`
 *
 * @publicApi
 */
export declare class JsonpInterceptor {
    private jsonp;
    constructor(jsonp: JsonpClientBackend);
    /**
     * Identifies and handles a given JSONP request.
     * @param req The outgoing request object to handle.
     * @param next The next interceptor in the chain, or the backend
     * if no interceptors remain in the chain.
     * @returns An observable of the event stream.
     */
    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>;
    static ɵfac: ɵngcc0.ɵɵFactoryDeclaration<JsonpInterceptor, never>;
    static ɵprov: ɵngcc0.ɵɵInjectableDeclaration<JsonpInterceptor>;
}

/**
 * A wrapper around the `XMLHttpRequest` constructor.
 *
 * @publicApi
 * @see `XhrFactory`
 * @deprecated
 * `XhrFactory` has moved, please import `XhrFactory` from `@angular/common` instead.
 */
export declare type XhrFactory = XhrFactory_2;

/**
 * A wrapper around the `XMLHttpRequest` constructor.
 *
 * @publicApi
 * @see `XhrFactory`
 * @deprecated
 * `XhrFactory` has moved, please import `XhrFactory` from `@angular/common` instead.
 */
export declare const XhrFactory: typeof XhrFactory_2;

export declare class ɵangular_packages_common_http_http_a implements HttpInterceptor {
    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>;
    static ɵfac: ɵngcc0.ɵɵFactoryDeclaration<ɵangular_packages_common_http_http_a, never>;
    static ɵprov: ɵngcc0.ɵɵInjectableDeclaration<ɵangular_packages_common_http_http_a>;
}

/**
 * DI token/abstract type representing a map of JSONP callbacks.
 *
 * In the browser, this should always be the `window` object.
 *
 *
 */
export declare abstract class ɵangular_packages_common_http_http_b {
    [key: string]: (data: any) => void;
}

/**
 * Factory function that determines where to store JSONP callbacks.
 *
 * Ordinarily JSONP callbacks are stored on the `window` object, but this may not exist
 * in test environments. In that case, callbacks are stored on an anonymous object instead.
 *
 *
 */
export declare function ɵangular_packages_common_http_http_c(): Object;

export declare const ɵangular_packages_common_http_http_d: InjectionToken<string>;

export declare const ɵangular_packages_common_http_http_e: InjectionToken<string>;

/**
 * `HttpXsrfTokenExtractor` which retrieves the token from a cookie.
 */
export declare class ɵangular_packages_common_http_http_f implements HttpXsrfTokenExtractor {
    private doc;
    private platform;
    private cookieName;
    private lastCookieString;
    private lastToken;
    constructor(doc: any, platform: string, cookieName: string);
    getToken(): string | null;
    static ɵfac: ɵngcc0.ɵɵFactoryDeclaration<ɵangular_packages_common_http_http_f, never>;
    static ɵprov: ɵngcc0.ɵɵInjectableDeclaration<ɵangular_packages_common_http_http_f>;
}

/**
 * `HttpInterceptor` which adds an XSRF token to eligible outgoing requests.
 */
export declare class ɵangular_packages_common_http_http_g implements HttpInterceptor {
    private tokenService;
    private headerName;
    constructor(tokenService: HttpXsrfTokenExtractor, headerName: string);
    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>;
    static ɵfac: ɵngcc0.ɵɵFactoryDeclaration<ɵangular_packages_common_http_http_g, never>;
    static ɵprov: ɵngcc0.ɵɵInjectableDeclaration<ɵangular_packages_common_http_http_g>;
}

/**
 * An injectable `HttpHandler` that applies multiple interceptors
 * to a request before passing it to the given `HttpBackend`.
 *
 * The interceptors are loaded lazily from the injector, to allow
 * interceptors to themselves inject classes depending indirectly
 * on `HttpInterceptingHandler` itself.
 * @see `HttpInterceptor`
 */
export declare class ɵHttpInterceptingHandler implements HttpHandler {
    private backend;
    private injector;
    private chain;
    constructor(backend: HttpBackend, injector: Injector);
    handle(req: HttpRequest<any>): Observable<HttpEvent<any>>;
    static ɵfac: ɵngcc0.ɵɵFactoryDeclaration<ɵHttpInterceptingHandler, never>;
    static ɵprov: ɵngcc0.ɵɵInjectableDeclaration<ɵHttpInterceptingHandler>;
}

export { }

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