HttpHelper.RequestPost(url, postData, ref responseJson, timeout);

//反序列化获得的json
response = (NoticeResponse)SerializeHelper.FromJson<NoticeResponse>(responseJson);

//do something

HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(url);

//myReq.KeepAlive = false;
myReq.Method = "POST";
myReq.Timeout = timeout;
myReq.ContentLength = reqPkg.Length;

//下面都是网上找的各种优化方法
myReq.ServicePoint.Expect100Continue = false;
//是否使用 Nagle 不使用 提高效率 
myReq.ServicePoint.UseNagleAlgorithm = false;
//最大连接数 
myReq.ServicePoint.ConnectionLimit = 65500;

Stream outStream = null;
StreamReader sr = null;
Stream receiveStream = null;
WebResponse myResp = null;

try
{
outStream = myReq.GetRequestStream();
outStream.Write(reqPkg, 0, reqPkg.Length);

myResp = myReq.GetResponse();
receiveStream = myResp.GetResponseStream();
sr = new StreamReader(receiveStream);
respPkg = sr.ReadToEnd();
}
finally
{
if (outStream != null) outStream.Close();

if (sr != null) sr.Close();

if (receiveStream != null) receiveStream.Close();

if (myResp != null) myResp.Close();

if (myReq != null) myReq.Abort();
}

System.Net.WebException: The operation has timed out
at System.Net.HttpWebRequest.GetResponse()