its Server status is returning"undefined"(200 for of condition).
Are you saying that the response is complete, the server response code is 200, but that the text returned form the server is not what you expected? If so, it's a server problem; make sure it serves what you expect it to serve.
If you mean something else, please be more elaborate:
TellTheDetails. As I said, seeing the JavaScript code would help diagnose this.