Post 提交错误 远程服务器返回错误: (411) 所需的长度。

这是由于在IIS7中站点被以POST方式请求时,必须要求传递参数,如果调用的API无须传递参数,需要标记下内容为0

 httpWebRequest.ContentLength = 0;

即可解决411异常.

 

  public static string Post(string url)
        {
            //垃圾回收，回收没有正常关闭的http连接
            System.GC.Collect();
            try
            {
                var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
                httpWebRequest.ContentType = "application/json";
                httpWebRequest.Method = "POST";

                httpWebRequest.ContentLength = 0;

                var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
                {
                    var result = streamReader.ReadToEnd();
                    return result;
                }
            }
            catch (Exception ex)
            {
                
            }
        }