title: What is the HTTP_PROFILE browser header and how is it used?
body: <p>I've just come across the <code>HTTP_PROFILE</code> header that seems to be used by mobile browsers to point to an <code>.xml</code> document describing the device's capabilities.</p>
  
  <p>Doing a Google search doesn't turn up any definitive resources on what this is and how it should be used, can anyone point me to something along the lines of a spec/W3C standard?</p>