fix(http): use Response for JSONP errors

Return Response when JSONP backend errors

modules/angular2/src/http/backends/jsonp_backend.ts

@@ -1,5 +1,5 @@
 import {ConnectionBackend, Connection} from '../interfaces';
-import {ReadyStates, RequestMethods} from '../enums';
+import {ReadyStates, RequestMethods, ResponseTypes} from '../enums';
 import {Request} from '../static_request';
 import {Response} from '../static_response';
 import {ResponseOptions, BaseResponseOptions} from '../base_response_options';
@@ -11,6 +11,10 @@ import {StringWrapper, isPresent} from 'angular2/src/core/facade/lang';
 // todo(robwormald): temporary until https://github.com/angular/angular/issues/4390 decided
 var Rx = require('@reactivex/rxjs/dist/cjs/Rx');
 var {Observable} = Rx;
+
+const JSONP_ERR_NO_CALLBACK = 'JSONP injected script did not invoke callback.';
+const JSONP_ERR_WRONG_METHOD = 'JSONP requests must use GET request method.';
+
 export abstract class JSONPConnection implements Connection {
   readyState: ReadyStates;
   request: Request;
@@ -28,7 +32,7 @@ export class JSONPConnection_ extends JSONPConnection {
               private baseResponseOptions?: ResponseOptions) {
     super();
     if (req.method !== RequestMethods.Get) {
-      throw makeTypeError("JSONP requests must use GET request method.");
+      throw makeTypeError(JSONP_ERR_WRONG_METHOD);
     }
     this.request = req;
     this.response = new Observable(responseObserver => {
@@ -56,7 +60,12 @@ export class JSONPConnection_ extends JSONPConnection {
         this.readyState = ReadyStates.Done;
         _dom.cleanup(script);
         if (!this._finished) {
-          responseObserver.error(makeTypeError('JSONP injected script did not invoke callback.'));
+          let responseOptions =
+              new ResponseOptions({body: JSONP_ERR_NO_CALLBACK, type: ResponseTypes.Error});
+          if (isPresent(baseResponseOptions)) {
+            responseOptions = baseResponseOptions.merge(responseOptions);
+          }
+          responseObserver.error(new Response(responseOptions));
           return;
         }
 
@@ -73,7 +82,11 @@ export class JSONPConnection_ extends JSONPConnection {
         if (this.readyState === ReadyStates.Cancelled) return;
         this.readyState = ReadyStates.Done;
         _dom.cleanup(script);
-        responseObserver.error(error);
+        let responseOptions = new ResponseOptions({body: error.message, type: ResponseTypes.Error});
+        if (isPresent(baseResponseOptions)) {
+          responseOptions = baseResponseOptions.merge(responseOptions);
+        }
+        responseObserver.error(new Response(responseOptions));
       };
 
       script.addEventListener('load', onLoad);

modules/angular2/test/http/backends/jsonp_backend_spec.ts

@@ -134,7 +134,7 @@ export function main() {
                  async.done();
                },
                err => {
-                 expect(StringWrapper.contains(err.message, 'did not invoke callback')).toBe(true);
+                 expect(err.text()).toEqual('JSONP injected script did not invoke callback.');
                  async.done();
                });
 
@@ -150,7 +150,7 @@ export function main() {
                  async.done();
                },
                err => {
-                 expect(err['message']).toBe('Oops!');
+                 expect(err.text()).toBe('Oops!');
                  async.done();
                });