angular 6在拦截器中获取响应头

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

@Injectable()
export class MyInterceptor implements HttpInterceptor {
  intercept(req: HttpRequest<any>, next: HttpHandler) {
    return next.handle(req).pipe(
      tap(event => {
        if (event instanceof HttpResponse) {
          const headers = event.headers;
          // 在这里可以访问响应头信息
          console.log(headers.get('header-name'));
        }
      })
    );
  }
}

import { HTTP_INTERCEPTORS } from '@angular/common/http';
import { MyInterceptor } from './my-interceptor';

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