feat(http): add support for blob as a response type (#10190)

modules/@angular/http/src/backends/xhr_backend.ts

@@ -120,6 +120,9 @@ export class XHRConnection implements Connection {
           case ResponseContentType.Text:
             _xhr.responseType = 'text';
             break;
+          case ResponseContentType.Blob:
+            _xhr.responseType = 'blob';
+            break;
           default:
             throw new Error('The selected responseType is not supported');
         }

modules/@angular/http/src/base_response_options.ts

@@ -46,9 +46,9 @@ import {ResponseOptionsArgs} from './interfaces';
 export class ResponseOptions {
   // TODO: FormData | Blob
   /**
-   * String, Object, ArrayBuffer representing the body of the {@link Response}.
+   * String, Object, ArrayBuffer or Blob representing the body of the {@link Response}.
    */
-  body: string|Object|ArrayBuffer;
+  body: string|Object|ArrayBuffer|Blob;
   /**
    * Http {@link http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html status code}
    * associated with the response.

modules/@angular/http/src/enums.ts

@@ -67,7 +67,8 @@ export enum ContentType {
  * @experimental
  */
 export enum ResponseContentType {
-  ArrayBuffer,
+  Text,
   Json,
-  Text
+  ArrayBuffer,
+  Blob
 }

modules/@angular/http/src/interfaces.ts

@@ -67,8 +67,7 @@ export interface RequestArgs extends RequestOptionsArgs { url: string; }
  * @experimental
  */
 export type ResponseOptionsArgs = {
-  // TODO: Support Blob, JSON
-  body?: string | Object | FormData | ArrayBuffer; status?: number; statusText?: string;
+  body?: string | Object | FormData | ArrayBuffer | Blob; status?: number; statusText?: string;
   headers?: Headers;
   type?: ResponseType;
   url?: string;