title: Removing HTTP headers from an XMLHttpRequest
body: <p>I am working on an ajax long polling type application, and I would like to minimize the amount of bandwidth I am using.  One of the big costs right now are the client side HTTP headers.  Once I have a connection established and a session id stored on the client, I don't really want to squander any more bandwidth transferring redundant http information (such as browser type, accept encodings, etc.).  Over the course of many connections, this quickly adds up to a lot of data!</p>
  
  <p>I would really like to just take my XMLHttpRequest and nuke all of the headers so that only the absolute minimum gets transmitted to the server.  Is it possible to do this?</p>