refactor(Http): implement Request object parameter for http.request

Fixes #2416

modules/angular2/src/http/http.ts

@@ -61,8 +61,12 @@ function httpRequest(backend: XHRBackend, request: Request) {
 export class Http {
   constructor(private backend: XHRBackend, private defaultOptions: BaseRequestOptions) {}
 
-  request(url: string, options?: RequestOptions): Rx.Observable<Response> {
+  request(url: string|Request, options?: RequestOptions): Rx.Observable<Response> {
+    if (typeof url === 'string') {
       return httpRequest(this.backend, new Request(url, this.defaultOptions.merge(options)));
+    } else if (url instanceof Request) {
+      return httpRequest(this.backend, url);
+    }
   }
 
   get(url: string, options?: RequestOptions) {
@@ -107,7 +111,11 @@ if (Rx.hasOwnProperty('default')) {
   Observable = Rx.Observable;
 }
 export function HttpFactory(backend: XHRBackend, defaultOptions: BaseRequestOptions) {
-  return function(url: string, options?: RequestOptions) {
+  return function(url: string | Request, options?: RequestOptions) {
+    if (typeof url === 'string') {
       return httpRequest(backend, new Request(url, defaultOptions.merge(options)));
+    } else if (url instanceof Request) {
+      return httpRequest(backend, url);
+    }
   }
 }

modules/angular2/test/http/http_spec.ts

@@ -17,6 +17,7 @@ import {MockBackend} from 'angular2/src/http/backends/mock_backend';
 import {Response} from 'angular2/src/http/static_response';
 import {RequestMethods} from 'angular2/src/http/enums';
 import {BaseRequestOptions} from 'angular2/src/http/base_request_options';
+import {Request} from 'angular2/src/http/static_request';
 
 class SpyObserver extends SpyObject {
   onNext: Function;
@@ -79,6 +80,12 @@ export function main() {
            connection.mockRespond(baseResponse)
          }));
 
+      it('should accept a fully-qualified request as its only parameter', () => {
+        var req = new Request('https://google.com');
+        backend.connections.subscribe(c => { expect(c.request.url).toBe('https://google.com'); });
+        httpFactory(req).subscribe(() => {});
+      });
+
 
       it('should perform a get request for given url if passed a ConnectionConfig instance',
          inject([AsyncTestCompleter], async => {
@@ -108,12 +115,23 @@ export function main() {
 
 
     describe('Http', () => {
+      describe('.request()', () => {
         it('should return an Observable', () => {
           expect(typeof http.request(url).subscribe).toBe('function');
           backend.resolveAllConnections();
         });
 
 
+        it('should accept a fully-qualified request as its only parameter', () => {
+          var req = new Request('https://google.com');
+          backend.connections.subscribe(c => {
+            expect(c.request.url).toBe('https://google.com');
+          });
+          http.request(req).subscribe(() =>{});
+        });
+      });
+
+
       it('should perform a get request for given url if only passed a string',
          inject([AsyncTestCompleter], (async) => {
            var connection;