Angular HttpInterceptor修改错误object

Question

我已经实现了一个 HttpInterceptor，它向每个请求添加一个 header，如果服务器以 [=15=] 响应，则重定向到登录页面。我不希望它做任何其他事情。

但是我注意到，每当我从服务器收到错误响应（如我所料）时，拦截器都会踢它并抛出 HttpErrorResponse。但是在我的控制器中，我只得到一个 TypeError object 而没有来自服务器的详细信息。

我附上相关代码。

拦截器

@Injectable()
export class HttpAuthorizationService implements HttpInterceptor {

  constructor(private cookieService: CookieService, private angularRouter: Router) { }

  intercept(req: HttpRequest<any>, next: HttpHandler):  Observable<HttpEvent<any>> {
    req = req.clone({
      setHeaders: {
        Authorization: 'Bearer ' + this.cookieService.get('Authorization')
      }
    });

    return next.handle(req).do((ev: HttpEvent<any>) => {})
    .catch(error => {
      if (error instanceof HttpErrorResponse) {
        if (error.status === 401) {
          this.cookieService.set('expired', 'Session expired');
          this.angularRouter.navigate(['/login']);
        }
      }
      return Observable.throw(error); <-- i think this is bad
    });
  }
}

和实际 控制器

deleteCategory(category) {
this.confirmationService.confirm({
  message: 'Are you sure you want to delete?',
  header: 'Delete product category ' + category,
  icon: 'fa fa-trash',
  accept: () => {
    this.productService.deleteCategory(category).subscribe(
      success => {
        this.msgs = [{ severity: 'success', summary: 'Success', detail: 'Successfully deleted the product category ' + category }];
      },
      error => {
        this.categories.push(category);
        this.msgs = [{ severity: 'error', summary: 'Could not delete category', detail: error.status + '-' + error.error }]; <-- getting object without error attribute and no info from the server
      }
    );
  },
  reject: () => this.categories.push(category)
});

}

我的问题是如何保留原始错误 object 而不是我实际得到的错误如果我不实现这个 HttpInterceptor，我的控制器就会得到正常的错误 object

Answer 1

我不得不向我的 HttpInterceptor 实现添加另一个导入

import 'rxjs/add/observable/throw';

Angular HttpInterceptor修改错误object

Angular HttpInterceptor modifies the error object

angular

angular2-observables