fix(http) : set response.ok based on given status code

Closes #8056

modules/angular2/src/http/static_response.ts

@@ -76,6 +76,7 @@ export class Response {
   constructor(responseOptions: ResponseOptions) {
     this._body = responseOptions.body;
     this.status = responseOptions.status;
+    this.ok = (this.status >= 200 && this.status <= 299);
     this.statusText = responseOptions.statusText;
     this.headers = responseOptions.headers;
     this.type = responseOptions.type;

modules/angular2/test/http/static_response_spec.ts

@@ -0,0 +1,24 @@
+import {
+  describe,
+  expect,
+  it,
+} from 'angular2/testing_internal';
+
+import {ResponseOptions} from 'angular2/src/http/base_response_options';
+import {Response} from 'angular2/src/http/static_response';
+
+
+
+export function main() {
+  describe('Response', () => {
+    it('should be ok for 200 statuses', () => {
+      expect(new Response(new ResponseOptions({status: 200})).ok).toEqual(true);
+      expect(new Response(new ResponseOptions({status: 299})).ok).toEqual(true);
+    });
+
+    it('should not be ok for non 200 statuses', () => {
+      expect(new Response(new ResponseOptions({status: 199})).ok).toEqual(false);
+      expect(new Response(new ResponseOptions({status: 300})).ok).toEqual(false);
+    });
+  });
+}