Angular httpClient 拦截器错误处理

Question

在阅读了有关 http 客户端错误处理的 Angular 文档后，我仍然不明白为什么我没有使用以下代码从服务器捕获 401 错误:

export class interceptor implements HttpInterceptor {
    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        console.log('this log is printed on the console!');

        return next.handle(request).do(() => (err: any) => {
            console.log('this log isn't');
            if (err instanceof HttpErrorResponse) {
                if (err.status === 401) {
                    console.log('nor this one!');
                }
            }
        });
    }
}

在控制台日志上，我也得到了这个:

zone.js:2969 GET http://localhost:8080/test 401 ()

core.js:1449 ERROR HttpErrorResponse {headers: HttpHeaders, status: 401, statusText: "OK", url: "http://localhost:8080/test", ok: false, …}

Answer 1

您的错误处理程序需要返回一个 new Observable<HttpEvent<any>>()

return next.handle(request)
    .pipe(catchError((err: any) => {
        console.log('this log isn't');
        if (err instanceof HttpErrorResponse) {
            if (err.status === 401) {
                console.log('Unauthorized');
            }
        }

      return new Observable<HttpEvent<any>>();
    }));