title: Have you ever seen a proxy removing POST request values?
body: <p>I have come acrooss a very strange problem.</p>
  
  <p>I use a POST request for asynchronous data transfer via XMLHHTPRequest. Some clients behind a proxy seem to send the request, but all POST data seems lost. After testing a few days I could not reproduce this on my local system. Could a proxy remove POST data, when there is no change in it?</p>