如果您在Angular中尝试读取响应头部信息，但无效，请尝试以下解决方法：

1. 使用HttpInterceptor拦截器来读取响应头部信息：

   import { Injectable } from '@angular/core';
   import { HttpInterceptor, HttpHandler, HttpRequest, HttpResponse } from '@angular/common/http';
   
   @Injectable()
   export class CustomHttpInterceptor implements HttpInterceptor {
     intercept(req: HttpRequest, next: HttpHandler) {
       return next.handle(req).pipe(
         tap(event => {
           if (event instanceof HttpResponse) {
             // 读取响应头部信息
             const headers = event.headers;
             console.log(headers);
           }
         })
       );
     }
   }
   

   然后在NgModule中将拦截器提供给提供商：

   import { NgModule } from '@angular/core';
   import { HTTP_INTERCEPTORS } from '@angular/common/http';
   import { CustomHttpInterceptor } from './custom-http-interceptor';
   
   @NgModule({
     providers: [
       {
         provide: HTTP_INTERCEPTORS,
         useClass: CustomHttpInterceptor,
         multi: true
       }
     ]
   })
   export class AppModule { }
   

2. 使用RxJS的map操作符来获取响应头部信息：

   import { HttpClient } from '@angular/common/http';
   
   constructor(private http: HttpClient) { }
   
   getHeaders() {
     return this.http.get('https://api.example.com').pipe(
       map(response => {
         // 读取响应头部信息
         const headers = response.headers;
         console.log(headers);
         return response;
       })
     );
   }
   

   然后在需要获取响应头部信息的地方调用getHeaders方法。

请注意，以上示例假设您已经正确地设置了Angular的HttpClient模块并发出了HTTP请求。如果您还没有设置HttpClient，请确保正确配置并发出请求。