Empty HTTP response headers and body

I am able to consistently reproduce this problem where I request a URL from 开发者_如何学JAVAmy server and I get back a 200 code but the response headers and response body are empty. If I monitor incoming traffic on my web server I never see the request come in. My web server sits behind a proxy server, if I monitor traffic there, I also do not see the request come in.

Any ideas as to where this empty response might be coming from, or tips as to what situations can result in an empty response like this?

This turned out to be a GET request size limit on our internal firewall proxy server. We were able to reduce the size at which we switch from a GET to a POST request in our code to avoid the limit.