GetResponseCode() returns -1,what does it mean

Hi ,
The HttpURLConnection class's getResponseCode() method returns -1.
getResponseMessage() returns null.i m accessing my servlet through a proxy.i know only about 1xx to 5xx codes.i dont know what does it mean by -1.But at server side the request is properly sent and processed and i m getting 200 and ok after processing at serverside. the object is sent to client also. but it is not received by the client.
Null object is returned.I think proxy is the culprit.If anyone can help me what -1 means,it will be really greatfull to diagnoise my issue in detail and solve my problem soon.
Your help will be greatfull.
Thanks
prakash

As it says perfectly clearly, right there in the API documentation for the method:
"Returns -1 if no code can be discerned from the response (i.e., the response is not valid HTTP)."

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