如何从加载angular应用程序的根URL截获HTTP请求头

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

@Injectable()
export class HttpInterceptorService implements HttpInterceptor {
  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // 在这里对请求进行处理
    // 可以获取请求头信息、修改请求头、添加额外的请求头等操作
    return next.handle(request);
  }
}

import { NgModule } from '@angular/core';
import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
import { HttpInterceptorService } from './http-interceptor.service';

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

intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
  if (request.url === '/') {
    // 在这里截获根URL的HTTP请求头
    console.log(request.headers);
  }
  return next.handle(request);
}