The module that includes http's providers
注解
@NgModule({ providers: [ { provide: Http, useFactory: httpFactory, deps: [XHRBackend, RequestOptions] }, BrowserXhr, { provide: RequestOptions, useClass: BaseRequestOptions }, { provide: ResponseOptions, useClass: BaseResponseOptions }, XHRBackend, { provide: XSRFStrategy, useFactory: _createDefaultCookieXSRFStrategy }, ] })
