HttpClient无法解析空响应

Question

我有一个拦截器,在标头中添加一个标记.但是,如果我在POST请求后使用它,则不会触发订阅中的Observer.

拦截器:

intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
this.authService = this.inj.get(AuthService);
if (!this.authService.isLoggedIn()) {
  return next.handle(req);
}

const changedReq = req.clone({headers: req.headers.set('Authorization', `Bearer ${this.authService.getToken()}`)});
return next.handle(changedReq);
}

服务:

saveBeer(beerForm: BeerForm): Observable<Response> {
let body = JSON.stringify(beerForm);
let headers = new HttpHeaders({
  'Content-Type': 'application/json'
});

return this.http.post(this.apiUrl, body, {headers: headers});
}

零件:

onSubmitCreateBeer(): void {
this.beerService.saveBeer(this.beerForm)
  .takeUntil(this.ngUnsubscribe)
  .subscribe(
    (response: Response) => {
      // On response
      this.router.navigate(['/beers']);
    }, error => {
      // On error
    }, () => {
      // On complete
    });
}

我的问题是,响应永远不会被触发,所以我的导航步骤不起作用.如果我禁用拦截器一切正常.

有任何想法吗？

Answer 1

我搞定了.问题是我的观察者在回应中期待json.然而,在我得到200 OK之后,响应中没有任何内容.这是一个错误,因此调用了错误函数.

解决方案1是设置responseType:text.

saveBeer(beerForm: BeerForm): Observable<any> {
let body = JSON.stringify(beerForm);
let headers = new HttpHeaders({
  'Content-Type': 'application/json'
});

return this.http.post(this.apiUrl, body, {headers: headers, responseType: 'text'});
}

解决方案2是从后端返回204.

两者现在都工作正常.有关于此的错误报告:

https://github.com/angular/angular/issues/18680