Method jsonp

packages/common/http/src/client.ts:1499–1505

* 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, *

(url: string, callbackParam: string)

   *
   */
  jsonp<T>(url: string, callbackParam: string): Observable<T> {
    return this.request<any>('JSONP', url, {
      params: new HttpParams().append(callbackParam, 'JSONP_CALLBACK'),
      observe: 'body',
      responseType: 'json',
    });
  }

  /**
   * Constructs an `OPTIONS` request that interprets the body as an