6

我在不同的 Angular 版本中多次发现这个问题,但多个消息来源说它已经修复,例如,Stackoverflow 上的另一个类似问题是有这个答案,它说它已在 Angular 5.2 中解决,Github 上的一些其他问题在说它在 6.0.2 中解决,我正在使用 Angular 6.0.3 但我仍然遇到这个问题,每当我尝试在我的 HttpInterceptor 类中注入使用 HttpClient 的服务时(如果在其中收到 jwt,则应该向请求添加一个 jwt 令牌服务)

我没有收到循环依赖的警告或错误,我可以在浏览器控制台中看到拦截器正在调用服务的数千个请求,反之亦然。

处理这个问题的正确方法是什么?(最好不要在本地存储中存储 jwt)

(即使用拦截器并从服务中获取 jwt)

我的服务:

 ....
 // only showing parts that matter, HttpClient is injected here
 // to be used in calling the API services

  constructor(public http: HttpClient, private route: ActivatedRoute,
 public translate: TranslateService, private router: Router,
 public snackBar: MatSnackBar, private notification: NotificationService) {

//

我的 HttpInterceptor:

import { Observable } from 'rxjs';
import { Location } from '@angular/common';
import { Injectable, Injector } from '@angular/core';
import { HttpInterceptor } from '@angular/common/http';
import { HttpRequest } from '@angular/common/http';
import { HttpHandler } from '@angular/common/http';
import { HttpEvent } from '@angular/common/http';
import { HttpHeaders } from '@angular/common/http';
import { DataService } from './data/data.service';

@Injectable()
export class CustomHttpInterceptor implements HttpInterceptor {
  constructor(private injector: Injector) {}

intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
  const dataService = this.injector.get(DataService);

  console.log('hey there, we are here INTERCEPTOR');
  if (dataService.jwt) {
        request = request.clone({
          setHeaders: {
            Authorization: `Bearer ${dataService.jwt}`
          }
        });
      }

    return next.handle(request);
  }
}

版本

Angular CLI: 6.0.8
Node: 10.0.0
OS: win32 x64
Angular: 6.0.7
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.6.3
@angular-devkit/build-angular     0.6.3
@angular-devkit/build-optimizer   0.6.3
@angular-devkit/core              0.6.3
@angular-devkit/schematics        0.6.8
@angular/cdk                      6.1.0
@angular/cli                      6.0.8
@angular/flex-layout              6.0.0-beta.15
@angular/material                 6.3.1
@ngtools/webpack                  6.0.3
@schematics/angular               0.6.8
@schematics/update                0.6.8
rxjs                              6.2.1
typescript                        2.7.2
webpack                           4.8.3
4

1 回答 1

0

我可以通过自己在服务中实例化 HttpClient 来解决它:

@Injectable()
export class DataService {

  private http: HttpClient;

  constructor(httpBackend: HttpBackend) {
    this.http = new HttpClient(httpBackend);    
  }
}

在我的情况下,这打破了无限循环问题(使用 Angular@6.1.10)。

于 2018-10-17T13:14:05.383 回答