在我的角度应用程序中,我看到chrome(取消)api调用太快了.我还有一个HttpInterceptor,如果请求没有完成,它会在500ms后触发每个HttpClient请求的加载指示符.但是,对于获取(取消)的请求,似乎没有任何新事件随后隐藏我的加载指示器.
有没有办法在HttpInterceptor中检测“已取消”的请求,以便我可以再次隐藏我的加载指示器？
export class GlobalHttpInterceptor implements HttpInterceptor {
constructor(
private sessionService: SessionService,private loadingService: LoadingService
) { }
intercept(
req: HttpRequest<any>,next: HttpHandler
): Observable<HttpEvent<any>> {
setTimeout(() => {
if (showLoading) {
this.loadingService.show();
}
},500);
let showLoading = true;
if (this.sessionService.headers.length > 0) {
for (const x of this.sessionService.headers) {
req = req.clone({
headers: req.headers.set(x.key,x.value)
});
}
}
return next.handle(req)
.do(
(response) => {
if (response instanceof HttpResponse) {
showLoading = false;
this.loadingService.hide();
}
},(error) => {
showLoading = false;
this.loadingService.hide();
});
}
}
解决方法
刚遇到同样的问题.即使取消http请求,finalize运算符似乎也会触发.
public intercept(
request: HttpRequest<any>,next: HttpHandler
): Observable<HttpSentEvent | HttpHeaderResponse | HttpProgressEvent | HttpResponse<any> | HttpUserEvent<any>> {
// request starts
return next.handle(request).pipe(
finalize(() => {
// request completes,errors,or is cancelled
})
);
}
