如何在本地处理错误并跳过 Angular HTTP 拦截器

我们可以通过some metadata context到HttpClient，然后在HttpInterceptor中检索它.

当然，这意味着要在HttpInterceptor中添加一些逻辑，但多亏了元数据上下文，这段代码可以更加通用，并且保持简单.

例如:

在api.service.ts:

this.httpClient
  .get('http://...', {
    context: new HttpContext().set(IGNORED_STATUSES, [404]),
  })
  .pipe(
    catchError((e) => {
      console.log('Error catched locally', e);
      return of(EMPTY);
    })
  )
  .subscribe();

在error.interceptor.ts:

export const IGNORED_STATUSES = new HttpContextToken<number[]>(() => []);

export class CustomHttpInterceptor implements HttpInterceptor {
  intercept(
    req: HttpRequest<any>,
    next: HttpHandler
  ): Observable<HttpEvent<any>> {
    const ignoredStatuses = req.context.get(IGNORED_STATUSES);

    return next.handle(req).pipe(
      catchError((e: HttpErrorResponse) => {

        // if ignored statuses are set
        // and returned status matched 
        if (ignoredStatuses?.includes(e.status)) {
          // rethrow error to be catched locally
          return throwError(() => e);
        }

        // process error...
        console.log('error interceptor !!', e);
        return of();
      })
    );
  }
}