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我正在构建一个使用jwt令牌的应用程序。仍然有几条路线不需要它们,但大多数呼叫需要令牌。所以我想扩展http类并添加我的自定义标题。我仍然想使用原始的http类进行正常的调用。我在线阅读(和在stackoverflow)关于这一点。但对于一些reasong我得到以下错误:为自定义用法扩展http class ion2/Angular2导致错误
EXCEPTION: Error in :0:0 caused by: No provider for ConnectionBackend!
我的应用程序模块如下所示:
@NgModule({
declarations: [
MyApp,
DashboardPage,
],
imports: [
IonicModule.forRoot(MyApp)
],
bootstrap: [IonicApp],
entryComponents: [
MyApp,
DashboardPage,
],
providers: [
{
provide: [Http,SecureHttpService],
deps: [XHRBackend, RequestOptions],
useFactory: (backend: XHRBackend, defaultOptions: RequestOptions) => {
return new SecureHttpService(backend, defaultOptions);
},
useClass: SecureHttpService
},
{
provide: ErrorHandler,
useClass: IonicErrorHandler,
},
SecureHttpService
]
})
export class AppModule {}
服务扩展看起来像这样
import { Injectable } from '@angular/core';
import { Http, ConnectionBackend, Headers, RequestOptions, Response, RequestOptionsArgs} from '@angular/http';
@Injectable()
export class SecureHttpService extends Http {
constructor(backend: ConnectionBackend, defaultOptions: RequestOptions) {
super(backend, defaultOptions);
}
}
,我想用它在另一个这样的服务:
constructor (private http: Http, private secureHttp: SecureHttpService) {}
我也试图使用提供这样的(不含http):
provide: SecureHttpService,
但一切我尝试了同样的错误结果。我没有得到这个错误,为什么它发生。
'{ 提供:[HTTP,SecureHttpService], DEPS:[XHRBackend,RequestOptions], useFactory:(后端:XHRBackend,defaultOptions:RequestOptions)=> { 返回新SecureHttpService(后端,defaultOptions); }, useClass:SecureHttpService }'我不确定,但可以同时使用useFactory和useClass方法吗? – Nikolai