@angular/common
Version:
Angular - commonly needed directives and services
323 lines (322 loc) • 170 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { Injectable } from '@angular/core';
import { of } from 'rxjs';
import { concatMap, filter, map } from 'rxjs/operators';
import { HttpHandler } from './backend';
import { HttpHeaders } from './headers';
import { HttpParams } from './params';
import { HttpRequest } from './request';
import { HttpResponse } from './response';
/**
* Constructs an instance of `HttpRequestOptions<T>` from a source `HttpMethodOptions` and
* the given `body`. This function clones the object and adds the body.
*
* 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.
*
*/
function addBody(options, body) {
return {
body,
headers: options.headers,
context: options.context,
observe: options.observe,
params: options.params,
reportProgress: options.reportProgress,
responseType: options.responseType,
withCredentials: options.withCredentials,
};
}
/**
* 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 class HttpClient {
constructor(handler) {
this.handler = handler;
}
/**
* Constructs an observable for a generic HTTP request that, when subscribed,
* fires the request through the chain of registered interceptors and on to the
* server.
*
* You can pass an `HttpRequest` directly as the only parameter. In this case,
* the call returns an observable of the raw `HttpEvent` stream.
*
* Alternatively you can pass an HTTP method as the first parameter,
* a URL string as the second, and an options hash containing the request body as the third.
* See `addBody()`. In this case, the specified `responseType` and `observe` options determine the
* type of returned observable.
* * The `responseType` value determines how a successful response body is parsed.
* * If `responseType` is the default `json`, you can pass a type interface for the resulting
* object as a type parameter to the call.
*
* The `observe` value determines the return type, according to what you are interested in
* observing.
* * An `observe` value of events returns an observable of the raw `HttpEvent` stream, including
* progress events by default.
* * An `observe` value of response returns an observable of `HttpResponse<T>`,
* where the `T` parameter depends on the `responseType` and any optionally provided type
* parameter.
* * An `observe` value of body returns an observable of `<T>` with the same `T` body type.
*
*/
request(first, url, options = {}) {
let req;
// First, check whether the primary argument is an instance of `HttpRequest`.
if (first instanceof HttpRequest) {
// It is. The other arguments must be undefined (per the signatures) and can be
// ignored.
req = first;
}
else {
// It's a string, so it represents a URL. Construct a request based on it,
// and incorporate the remaining arguments (assuming `GET` unless a method is
// provided.
// Figure out the headers.
let headers = undefined;
if (options.headers instanceof HttpHeaders) {
headers = options.headers;
}
else {
headers = new HttpHeaders(options.headers);
}
// Sort out parameters.
let params = undefined;
if (!!options.params) {
if (options.params instanceof HttpParams) {
params = options.params;
}
else {
params = new HttpParams({ fromObject: options.params });
}
}
// Construct the request.
req = new HttpRequest(first, url, (options.body !== undefined ? options.body : null), {
headers,
context: options.context,
params,
reportProgress: options.reportProgress,
// By default, JSON is assumed to be returned for all calls.
responseType: options.responseType || 'json',
withCredentials: options.withCredentials,
});
}
// Start with an Observable.of() the initial request, and run the handler (which
// includes all interceptors) inside a concatMap(). This way, the handler runs
// inside an Observable chain, which causes interceptors to be re-run on every
// subscription (this also makes retries re-run the handler, including interceptors).
const events$ = of(req).pipe(concatMap((req) => this.handler.handle(req)));
// If coming via the API signature which accepts a previously constructed HttpRequest,
// the only option is to get the event stream. Otherwise, return the event stream if
// that is what was requested.
if (first instanceof HttpRequest || options.observe === 'events') {
return events$;
}
// The requested stream contains either the full response or the body. In either
// case, the first step is to filter the event stream to extract a stream of
// responses(s).
const res$ = events$.pipe(filter((event) => event instanceof HttpResponse));
// Decide which stream to return.
switch (options.observe || 'body') {
case 'body':
// The requested stream is the body. Map the response stream to the response
// body. This could be done more simply, but a misbehaving interceptor might
// transform the response body into a different format and ignore the requested
// responseType. Guard against this by validating that the response is of the
// requested type.
switch (req.responseType) {
case 'arraybuffer':
return res$.pipe(map((res) => {
// Validate that the body is an ArrayBuffer.
if (res.body !== null && !(res.body instanceof ArrayBuffer)) {
throw new Error('Response is not an ArrayBuffer.');
}
return res.body;
}));
case 'blob':
return res$.pipe(map((res) => {
// Validate that the body is a Blob.
if (res.body !== null && !(res.body instanceof Blob)) {
throw new Error('Response is not a Blob.');
}
return res.body;
}));
case 'text':
return res$.pipe(map((res) => {
// Validate that the body is a string.
if (res.body !== null && typeof res.body !== 'string') {
throw new Error('Response is not a string.');
}
return res.body;
}));
case 'json':
default:
// No validation needed for JSON responses, as they can be of any type.
return res$.pipe(map((res) => res.body));
}
case 'response':
// The response stream was requested directly, so return it.
return res$;
default:
// Guard against new future observe types being added.
throw new Error(`Unreachable: unhandled observe type ${options.observe}}`);
}
}
/**
* Constructs an observable that, when subscribed, causes the configured
* `DELETE` request to execute on the server. See the individual overloads for
* details on the return type.
*
* @param url The endpoint URL.
* @param options The HTTP options to send with the request.
*
*/
delete(url, options = {}) {
return this.request('DELETE', url, options);
}
/**
* Constructs an observable that, when subscribed, causes the configured
* `GET` request to execute on the server. See the individual overloads for
* details on the return type.
*/
get(url, options = {}) {
return this.request('GET', url, options);
}
/**
* Constructs an observable that, when subscribed, causes the configured
* `HEAD` request to execute on the server. The `HEAD` method returns
* meta information about the resource without transferring the
* resource itself. See the individual overloads for
* details on the return type.
*/
head(url, options = {}) {
return this.request('HEAD', url, options);
}
/**
* Constructs an `Observable` that, when subscribed, causes a request with the special method
* `JSONP` to be dispatched via the interceptor pipeline.
* The [JSONP pattern](https://en.wikipedia.org/wiki/JSONP) works around limitations of certain
* API endpoints that don't support newer,
* and preferable [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS) protocol.
* JSONP treats the endpoint API as a JavaScript file and tricks the browser to process the
* requests even if the API endpoint is not located on the same domain (origin) as the client-side
* application making the request.
* The endpoint API must support JSONP callback for JSONP requests to work.
* The resource API returns the JSON response wrapped in a callback function.
* You can pass the callback function name as one of the query parameters.
* Note that JSONP requests can only be used with `GET` requests.
*
* @param url The resource URL.
* @param callbackParam The callback function name.
*
*/
jsonp(url, callbackParam) {
return this.request('JSONP', url, {
params: new HttpParams().append(callbackParam, 'JSONP_CALLBACK'),
observe: 'body',
responseType: 'json',
});
}
/**
* Constructs an `Observable` that, when subscribed, causes the configured
* `OPTIONS` request to execute on the server. This method allows the client
* to determine the supported HTTP methods and other capabilites of an endpoint,
* without implying a resource action. See the individual overloads for
* details on the return type.
*/
options(url, options = {}) {
return this.request('OPTIONS', url, options);
}
/**
* Constructs an observable that, when subscribed, causes the configured
* `PATCH` request to execute on the server. See the individual overloads for
* details on the return type.
*/
patch(url, body, options = {}) {
return this.request('PATCH', url, addBody(options, body));
}
/**
* Constructs an observable that, when subscribed, causes the configured
* `POST` request to execute on the server. The server responds with the location of
* the replaced resource. See the individual overloads for
* details on the return type.
*/
post(url, body, options = {}) {
return this.request('POST', url, addBody(options, body));
}
/**
* Constructs an observable that, when subscribed, causes the configured
* `PUT` request to execute on the server. The `PUT` method replaces an existing resource
* with a new set of values.
* See the individual overloads for details on the return type.
*/
put(url, body, options = {}) {
return this.request('PUT', url, addBody(options, body));
}
}
HttpClient.decorators = [
{ type: Injectable }
];
HttpClient.ctorParameters = () => [
{ type: HttpHandler }
];
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Injectable} from '@angular/core';\nimport {Observable, of} from 'rxjs';\nimport {concatMap, filter, map} from 'rxjs/operators';\n\nimport {HttpHandler} from './backend';\nimport {HttpContext} from './context';\nimport {HttpHeaders} from './headers';\nimport {HttpParams, HttpParamsOptions} from './params';\nimport {HttpRequest} from './request';\nimport {HttpEvent, HttpResponse} from './response';\n\n\n/**\n * Constructs an instance of `HttpRequestOptions<T>` from a source `HttpMethodOptions` and\n * the given `body`. This function clones the object and adds the body.\n *\n * Note that the `responseType` *options* value is a String that identifies the\n * single data type of the response.\n * A single overload version of the method handles each response type.\n * The value of `responseType` cannot be a union, as the combined signature could imply.\n *\n */\nfunction addBody<T>(\n    options: {\n      headers?: HttpHeaders|{[header: string]: string | string[]},\n      context?: HttpContext,\n      observe?: 'body'|'events'|'response',\n      params?: HttpParams|\n            {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n      reportProgress?: boolean,\n      responseType?: 'arraybuffer'|'blob'|'json'|'text',\n      withCredentials?: boolean,\n    },\n    body: T|null): any {\n  return {\n    body,\n    headers: options.headers,\n    context: options.context,\n    observe: options.observe,\n    params: options.params,\n    reportProgress: options.reportProgress,\n    responseType: options.responseType,\n    withCredentials: options.withCredentials,\n  };\n}\n\n/**\n * Performs HTTP requests.\n * This service is available as an injectable class, with methods to perform HTTP requests.\n * Each request method has multiple signatures, and the return type varies based on\n * the signature that is called (mainly the values of `observe` and `responseType`).\n *\n * Note that the `responseType` *options* value is a String that identifies the\n * single data type of the response.\n * A single overload version of the method handles each response type.\n * The value of `responseType` cannot be a union, as the combined signature could imply.\n\n *\n * @usageNotes\n * Sample HTTP requests for the [Tour of Heroes](/tutorial/toh-pt0) application.\n *\n * ### HTTP Request Example\n *\n * ```\n *  // GET heroes whose name contains search term\n * searchHeroes(term: string): observable<Hero[]>{\n *\n *  const params = new HttpParams({fromString: 'name=term'});\n *    return this.httpClient.request('GET', this.heroesUrl, {responseType:'json', params});\n * }\n * ```\n *\n * Alternatively, the parameter string can be used without invoking HttpParams\n * by directly joining to the URL.\n * ```\n * this.httpClient.request('GET', this.heroesUrl + '?' + 'name=term', {responseType:'json'});\n * ```\n *\n *\n * ### JSONP Example\n * ```\n * requestJsonp(url, callback = 'callback') {\n *  return this.httpClient.jsonp(this.heroesURL, callback);\n * }\n * ```\n *\n * ### PATCH Example\n * ```\n * // PATCH one of the heroes' name\n * patchHero (id: number, heroName: string): Observable<{}> {\n * const url = `${this.heroesUrl}/${id}`;   // PATCH api/heroes/42\n *  return this.httpClient.patch(url, {name: heroName}, httpOptions)\n *    .pipe(catchError(this.handleError('patchHero')));\n * }\n * ```\n *\n * @see [HTTP Guide](guide/http)\n * @see [HTTP Request](api/common/http/HttpRequest)\n *\n * @publicApi\n */\n@Injectable()\nexport class HttpClient {\n  constructor(private handler: HttpHandler) {}\n\n  /**\n   * Sends an `HttpRequest` and returns a stream of `HttpEvent`s.\n   *\n   * @return An `Observable` of the response, with the response body as a stream of `HttpEvent`s.\n   */\n  request<R>(req: HttpRequest<any>): Observable<HttpEvent<R>>;\n\n  /**\n   * Constructs a request that interprets the body as an `ArrayBuffer` and returns the response in\n   * an `ArrayBuffer`.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   *\n   * @return An `Observable` of the response, with the response body as an `ArrayBuffer`.\n   */\n  request(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]},\n    context?: HttpContext,\n    observe?: 'body',\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    reportProgress?: boolean, responseType: 'arraybuffer',\n    withCredentials?: boolean,\n  }): Observable<ArrayBuffer>;\n\n  /**\n   * Constructs a request that interprets the body as a blob and returns\n   * the response as a blob.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of the response, with the response body of type `Blob`.\n   */\n  request(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]},\n    context?: HttpContext,\n    observe?: 'body',\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    reportProgress?: boolean, responseType: 'blob',\n    withCredentials?: boolean,\n  }): Observable<Blob>;\n\n  /**\n   * Constructs a request that interprets the body as a text string and\n   * returns a string value.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of the response, with the response body of type string.\n   */\n  request(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]},\n    context?: HttpContext,\n    observe?: 'body',\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    reportProgress?: boolean, responseType: 'text',\n    withCredentials?: boolean,\n  }): Observable<string>;\n\n  /**\n   * Constructs a request that interprets the body as an `ArrayBuffer` and returns the\n   * the full event stream.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of the response, with the response body as an array of `HttpEvent`s for\n   * the request.\n   */\n  request(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]},\n    context?: HttpContext,\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n          observe: 'events',\n    reportProgress?: boolean, responseType: 'arraybuffer',\n    withCredentials?: boolean,\n  }): Observable<HttpEvent<ArrayBuffer>>;\n\n  /**\n   * Constructs a request that interprets the body as a `Blob` and returns\n   * the full event stream.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of all `HttpEvent`s for the request,\n   * with the response body of type `Blob`.\n   */\n  request(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]}, observe: 'events',\n    context?: HttpContext,\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    reportProgress?: boolean, responseType: 'blob',\n    withCredentials?: boolean,\n  }): Observable<HttpEvent<Blob>>;\n\n  /**\n   * Constructs a request which interprets the body as a text string and returns the full event\n   * stream.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of all `HttpEvent`s for the request,\n   * with the response body of type string.\n   */\n  request(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]}, observe: 'events',\n    context?: HttpContext,\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    reportProgress?: boolean, responseType: 'text',\n    withCredentials?: boolean,\n  }): Observable<HttpEvent<string>>;\n\n  /**\n   * Constructs a request which interprets the body as a JSON object and returns the full event\n   * stream.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the  request.\n   *\n   * @return An `Observable` of all `HttpEvent`s for the request,\n   * with the response body of type `Object`.\n   */\n  request(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]},\n    context?: HttpContext,\n    reportProgress?: boolean, observe: 'events',\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    responseType?: 'json',\n    withCredentials?: boolean,\n  }): Observable<HttpEvent<any>>;\n\n  /**\n   * Constructs a request which interprets the body as a JSON object and returns the full event\n   * stream.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of all `HttpEvent`s for the request,\n   * with the response body of type `R`.\n   */\n  request<R>(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]},\n    context?: HttpContext,\n    reportProgress?: boolean, observe: 'events',\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    responseType?: 'json',\n    withCredentials?: boolean,\n  }): Observable<HttpEvent<R>>;\n\n  /**\n   * Constructs a request which interprets the body as an `ArrayBuffer`\n   * and returns the full `HttpResponse`.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of the `HttpResponse`, with the response body as an `ArrayBuffer`.\n   */\n  request(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]}, observe: 'response',\n    context?: HttpContext,\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    reportProgress?: boolean, responseType: 'arraybuffer',\n    withCredentials?: boolean,\n  }): Observable<HttpResponse<ArrayBuffer>>;\n\n  /**\n   * Constructs a request which interprets the body as a `Blob` and returns the full `HttpResponse`.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of the `HttpResponse`, with the response body of type `Blob`.\n   */\n  request(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]}, observe: 'response',\n    context?: HttpContext,\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    reportProgress?: boolean, responseType: 'blob',\n    withCredentials?: boolean,\n  }): Observable<HttpResponse<Blob>>;\n\n  /**\n   * Constructs a request which interprets the body as a text stream and returns the full\n   * `HttpResponse`.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of the HTTP response, with the response body of type string.\n   */\n  request(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]}, observe: 'response',\n    context?: HttpContext,\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    reportProgress?: boolean, responseType: 'text',\n    withCredentials?: boolean,\n  }): Observable<HttpResponse<string>>;\n\n  /**\n   * Constructs a request which interprets the body as a JSON object and returns the full\n   * `HttpResponse`.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of the full `HttpResponse`,\n   * with the response body of type `Object`.\n   */\n  request(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]},\n    context?: HttpContext,\n    reportProgress?: boolean, observe: 'response',\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    responseType?: 'json',\n    withCredentials?: boolean,\n  }): Observable<HttpResponse<Object>>;\n\n  /**\n   * Constructs a request which interprets the body as a JSON object and returns\n   * the full `HttpResponse` with the response body in the requested type.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return  An `Observable` of the full `HttpResponse`, with the response body of type `R`.\n   */\n  request<R>(method: string, url: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]},\n    context?: HttpContext,\n    reportProgress?: boolean, observe: 'response',\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    responseType?: 'json',\n    withCredentials?: boolean,\n  }): Observable<HttpResponse<R>>;\n\n  /**\n   * Constructs a request which interprets the body as a JSON object and returns the full\n   * `HttpResponse` as a JSON object.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of the `HttpResponse`, with the response body of type `Object`.\n   */\n  request(method: string, url: string, options?: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]},\n    context?: HttpContext,\n    observe?: 'body',\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    responseType?: 'json',\n    reportProgress?: boolean,\n    withCredentials?: boolean,\n  }): Observable<Object>;\n\n  /**\n   * Constructs a request which interprets the body as a JSON object\n   * with the response body of the requested type.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of the `HttpResponse`, with the response body of type `R`.\n   */\n  request<R>(method: string, url: string, options?: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]},\n    context?: HttpContext,\n    observe?: 'body',\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    responseType?: 'json',\n    reportProgress?: boolean,\n    withCredentials?: boolean,\n  }): Observable<R>;\n\n  /**\n   * Constructs a request where response type and requested observable are not known statically.\n   *\n   * @param method  The HTTP method.\n   * @param url     The endpoint URL.\n   * @param options The HTTP options to send with the request.\n   *\n   * @return An `Observable` of the reuested response, wuth body of type `any`.\n   */\n  request(method: string, url: string, options?: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]},\n    context?: HttpContext,\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    observe?: 'body'|'events'|'response',\n    reportProgress?: boolean,\n    responseType?: 'arraybuffer'|'blob'|'json'|'text',\n    withCredentials?: boolean,\n  }): Observable<any>;\n\n  /**\n   * Constructs an observable for a generic HTTP request that, when subscribed,\n   * fires the request through the chain of registered interceptors and on to the\n   * server.\n   *\n   * You can pass an `HttpRequest` directly as the only parameter. In this case,\n   * the call returns an observable of the raw `HttpEvent` stream.\n   *\n   * Alternatively you can pass an HTTP method as the first parameter,\n   * a URL string as the second, and an options hash containing the request body as the third.\n   * See `addBody()`. In this case, the specified `responseType` and `observe` options determine the\n   * type of returned observable.\n   *   * The `responseType` value determines how a successful response body is parsed.\n   *   * If `responseType` is the default `json`, you can pass a type interface for the resulting\n   * object as a type parameter to the call.\n   *\n   * The `observe` value determines the return type, according to what you are interested in\n   * observing.\n   *   * An `observe` value of events returns an observable of the raw `HttpEvent` stream, including\n   * progress events by default.\n   *   * An `observe` value of response returns an observable of `HttpResponse<T>`,\n   * where the `T` parameter depends on the `responseType` and any optionally provided type\n   * parameter.\n   *   * An `observe` value of body returns an observable of `<T>` with the same `T` body type.\n   *\n   */\n  request(first: string|HttpRequest<any>, url?: string, options: {\n    body?: any,\n    headers?: HttpHeaders|{[header: string]: string | string[]},\n    context?: HttpContext,\n    observe?: 'body'|'events'|'response',\n    params?: HttpParams|\n          {[param: string]: string | number | boolean | ReadonlyArray<string|number|boolean>},\n    reportProgress?: boolean,\n    responseType?: 'arraybuffer'|'blob'|'json'|'text',\n    withCredentials?: boolean,\n  } = {}): Observable<any> {\n    let req: HttpRequest<any>;\n    // First, check whether the primary argument is an instance of `HttpRequest`.\n    if (first instanceof HttpRequest) {\n      // It is. The other arguments must be undefined (per the signatures) and can be\n      // ignored.\n      req = first;\n    } else {\n      // It's a string, so it represents a URL. Construct a request based on it,\n      // and incorporate the remaining arguments (assuming `GET` unless a method is\n      // provided.\n\n      // Figure out the headers.\n      let headers: HttpHeaders|undefined = undefined;\n      if (options.headers instanceof HttpHeaders) {\n        headers = options.headers;\n      } else {\n        headers = new HttpHeaders(options.headers);\n      }\n\n      // Sort out parameters.\n      let params: HttpParams|undefined = undefined;\n      if (!!options.params) {\n        if (options.params instanceof HttpParams) {\n          params = options.params;\n        } else {\n          params = new HttpParams({fromObject: options.params} as HttpParamsOptions);\n        }\n      }\n\n      // Construct the request.\n      req = new HttpRequest(first, url!, (options.body !== undefined ? options.body : null), {\n        headers,\n        context: options.context,\n        params,\n        reportProgress: options.reportProgress,\n        // By default, JSON is assumed to be returned for all calls.\n        responseType: options.responseType || 'json',\n        withCredentials: options.withCredentials,\n      });\n    }\n\n    // Start with an Observable.of() the initial request, and run the handler (which\n    // includes all interceptors) inside a concatMap(). This way, the handler runs\n    // inside an Observable chain, which causes interceptors to be re-run on every\n    // subscription (this also makes retries re-run the handler, including interceptors).\n    const events$: Observable<HttpEvent<any>> =\n        of(req).pipe(concatMap((req: HttpRequest<any>) => this.handler.handle(req)));\n\n    // If coming via the API signature which accepts a previously constructed HttpRequest,\n    // the only option is to get the event stream. Otherwise, return the event stream if\n    // that is what was requested.\n    if (first instanceof HttpRequest || options.observe === 'events') {\n      return events$;\n    }\n\n    // The requested stream contains either the full response or the body. In either\n    // case, the first step is to filter the event stream to extract a stream of\n    // responses(s).\n    const res$: Observable<HttpResponse<any>> = <Observable<HttpResponse<any>>>events$.pipe(\n        filter((event: HttpEvent<any>) => event instanceof HttpResponse));\n\n    // Decide which stream to return.\n    switch (options.observe || 'body') {\n      case 'body':\n        // The requested stream is the b