Angular 5.2 & RxJS 5.5 HttpInterceptor retryWhen，但是更新请求？

import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpRequest, HttpHandler, HttpEvent } from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { retryWhen, mergeMap, delay, take } from 'rxjs/operators';

@Injectable()
export class RetryInterceptor implements HttpInterceptor {
  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    return next.handle(request).pipe(
      retryWhen(errors => {
        let retries = 0;
        return errors.pipe(
          mergeMap(error => {
            if (retries < 3) {
              retries++;
              // 更新请求，修改URL
              const updatedRequest = request.clone({ url: 'https://example.com/api/update' });
              return throwError(updatedRequest);
            }
            return throwError(error);
          }),
          delay(1000),
          take(3) // 最多重试3次
        );
      })
    );
  }
}