[fix] manage connection manually to prevent request timeout

Author: shabicheng

SLSSDK/Common/Communication/ServiceClientImpl.cs

@@ -280,16 +280,18 @@ private static void SetRequestContent(HttpWebRequest webRequest,
             webRequest.KeepAlive = false;
             webRequest.ServicePoint.ConnectionLeaseTimeout = 5000;
             webRequest.ServicePoint.MaxIdleTime = 5000;
-            //webRequest.ReadWriteTimeout = 100000000;
             webRequest.ServicePoint.ConnectionLimit = 1000;
             webRequest.ServicePoint.Expect100Continue = false;
-            //webRequest.ServicePoint.CloseConnectionGroup();
+            // Generate GUID for connection group name, force close it when request is done.
+            webRequest.ConnectionGroupName = Guid.NewGuid().ToString();
+
             using (var requestStream = webRequest.GetRequestStream())
             {
                 data.WriteTo(requestStream, webRequest.ContentLength);
                 data.Seek(0, SeekOrigin.Begin);
                 requestStream.Flush();
                 requestStream.Close();
+                
             }
             data.Close();
             data.Dispose();

SLSSDK/Common/Communication/ServiceRequest.cs

@@ -150,6 +150,9 @@ protected virtual void Dispose(bool disposing)
                 }
                 if (HttpRequest != null)
                 {
+                    // force close connection group
+                    //Console.WriteLine(HttpRequest.ConnectionGroupName + "[]" + HttpRequest.ConnectionGroupName.Length.ToString() + "[]" + HttpRequest.ServicePoint.CurrentConnections.ToString());
+                    HttpRequest.ServicePoint.CloseConnectionGroup(HttpRequest.ConnectionGroupName);
                     HttpRequest.Abort();
                     HttpRequest = null;
                 }