Angular 7 HTTP 拦截器不工作

Question

我是 Angular 的新手，我正在尝试实现 api 调用，它在 header 中发送令牌给所有 api，所以我正在使用拦截器。

我无法在请求中设置 header。

jwt.interceptor.ts

import { Injectable } from '@angular/core';
import { HttpRequest, HttpHandler, HttpEvent, HttpInterceptor } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable()
export class JwtInterceptor implements HttpInterceptor {
    constructor() { }

    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {

        let currentUser = localStorage.getItem('useremail')
        let currentUserToken = localStorage.getItem('token')
        if (currentUser && currentUserToken) {
            request = request.clone({
                setHeaders: {
                    'Authorization': `${currentUserToken}`
                }
            });
        }
        // console.log("Request", request)
        return next.handle(request);
    }
}

app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
import { AppUserListingComponent } from './app-user-listing/app-user-listing.component';
import { JwtInterceptor } from './jwt.interceptor';

@NgModule({
  providers: [ { provide: HTTP_INTERCEPTORS, useClass: JwtInterceptor, multi: true } ],
  bootstrap: [AppComponent]
})
export class AppModule { }

user-listing.service.ts

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { map } from 'rxjs/operators';

@Injectable({
  providedIn: 'root'
})
export class UserListingService {
  apiUrl = "URL";
  constructor(
    private http: HttpClient
  ) { }

  fetchAllUsers() {
    return this.http.get(`${this.apiUrl}/fetchAdminsUsers`)
  }

}

我的代码不起作用的原因是什么？

提前致谢

Answer 1

尝试使用如下实例。

return next.handle(request).pipe(
            tap(
                event => {
                    if(event instanceof HttpResponse){
                        //api call success
                         console.log('success in calling API : ', event);
                    }
                },
                error => {
                    if(event instanceof HttpResponse){
                        //api call error
                        console.log('error in calling API : ', event);
                    }
                }
            )
        )

Answer 2

Authorization是一个特殊的header，需要在请求中添加withCredentials: true才能添加。

        request = request.clone({
            setHeaders: {
                'Authorization': `${currentUserToken}`
            },
            withCredentials: true
        });

Answer 3

在@NgModule中添加imports: [BrowserModule, HttpClientModule]。

Answer 4

在您的 app.module.ts 代码中没有 import: [HttpClientModule] 您是否导入了 HttpClientModule？

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