c#_HttpClient

        private void OpenPost()//同步
        {
            using (HttpClient client = new HttpClient())
            {
               client.DefaultRequestHeaders.Add("name","zhuzili");
               var response =  client.PostAsync("http://www.baidu.com",null).Result;
               var str = response.Content.ReadAsStringAsync().Result;
               MessageBox.Show(str);
            }
        }