使用httpclient 4.x验证单个请求

我有一个 HttpClient 由多个线程共享的实例。我想用它发出一个经过身份验证的请求。因为只应对单个请求进行身份验证,所以我不想修改 HTTP客户端 实例,如 documentation . 这是我做出来的,但没有用。据我所知,它看起来不像 CredentialsProvider 正在被使用。有什么小窍门吗?

HttpContext context = null;
if(feedSpec.isAuthenticated()) {
  context = new BasicHttpContext();
  CredentialsProvider credsProvider = new BasicCredentialsProvider();
  credsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(feedSpec.getHttpUsername(), feedSpec.getHttpPassword()));
  context.setAttribute(ClientContext.CREDS_PROVIDER, credsProvider);
  context.setAttribute(ClientPNames.HANDLE_AUTHENTICATION, true);
}
HttpGet httpGet = new HttpGet(feedSpec.getUri());
HttpResponse httpResponse = httpClient.execute(httpGet, context);