Angular HttpInterceptor没有添加响应头

import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpRequest, HttpHandler, HttpEvent } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable()
export class CustomInterceptor implements HttpInterceptor {
  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // 发送请求前的处理逻辑

    return next.handle(request).pipe(
      tap((event: HttpEvent<any>) => {
        if (event instanceof HttpResponse) {
          // 添加响应头
          event.headers.set('headerName', 'headerValue');
        }
      })
    );
  }
}

import { NgModule } from '@angular/core';
import { HTTP_INTERCEPTORS } from '@angular/common/http';

import { CustomInterceptor } from './custom-interceptor';

@NgModule({
  providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: CustomInterceptor,
      multi: true
    }
  ]
})
export class AppModule { }