Question

我想创建自己的http服务，以便我可以像http拦截器一样使用它但是我得到一个很长的错误，它始于：EXCEPTION: Uncaught (in promise): Error: No provider for XHRBackend!

http.service.ts

import { Injectable } from '@angular/core';
import { Http, XHRBackend, RequestOptions, RequestOptionsArgs, Request, Response } from '@angular/http';
import { Observable } from 'rxjs/Observable';


@Injectable()
export class HttpService extends Http {
    constructor(backend: XHRBackend, options: RequestOptions) {
        console.log('HttpService constructor');
        super(backend, options);
    }

    request(url: string|Request, options?: RequestOptionsArgs): Observable<Response> {
        console.log('HttpService request');
        return super.request(url, options);
    }    
}

export const HTTP_SERVICE = {
    provide: HttpService,
    useFactory: (backend: XHRBackend, options: RequestOptions) => {
        return new HttpService(backend, options);
    },
    deps: [XHRBackend, RequestOptions]
};

然后我将其添加到app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AppRoutingModule } from './app-routing.module';

import { AppComponent } from './app.component';

import { AuthService } from './auth/auth.service';
import { HTTP_SERVICE } from './shared/http/http.service';

@NgModule({
    imports: [
        BrowserModule,
        AppRoutingModule
    ],
    declarations: [
        AppComponent
    ],
    providers: [
        AuthService,
        HTTP_SERVICE
    ],
    bootstrap: [AppComponent]
})
export class AppModule { }

但是当我将它注入组件中的构造函数时它不起作用。我收到了提到的错误。

我还读到我可以这样做：

{ provide: Http, useClass: HttpService}

来自此博客：http://www.adonespitogo.com/articles/angular-2-extending-http-provider/

但这也行不通。在这里我没有错误，但没有什么不同。我没有按照我对代码的期望输出到控制台。

我还尝试在提供程序数组中添加HttpService，但仍然出现错误。

Answer 1

正如Mukul Jayaprakash所述，在httpModule中添加imports将解决此问题。

Angular 2自定义http服务抛出错误：没有XHRBackend的提供程序

1 个答案: