title: HTTP Accept "level"?
body: <p>I have been reading up on the <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1" rel="noreferrer">HTTP/1.1 headers</a> and in some of the sample headers in section 14.1 (Accept) they use <code>accept-extension</code>s (I believe that is what they are) called <code>level=1</code>, <code>level=2</code>, etc.</p>
  
  <p>The problem I am having is that they use these <code>level=X</code> things as if it should be obvious what they do. Is the document just poor at explaining it or am I missing something?</p>
  
  <p>Thanks.</p>