title: Determine content-length using urllib2
body: <p>I'm making a request via urllib2 that is coming back with the following headers:</p>
  
  <pre><code>&gt;&gt;&gt; dict(response.info())
  {'expires': 'Wed, 31 Dec 1969 19:00:00 EST, Wed, 31 Dec 1969 19:00:00 EST', 'server': 'Apache-Coyote/1.1, Apache-Coyote/1.1', 'connection': 'close', 'pragma': 'No-cache, No-cache', 'cache-control': 'no-cache, no-cache', 'date': 'Thu, 19 Jan 2012 20:16:00 GMT', 'content-type': 'audio/mpeg'}
  </code></pre>
  
  <p>As I understand it, since 'connection: close' is set, the request will keep streaming back until the remote host finishes, so no Content-Length  is set.  It seems like I should be able to determine the length of the content by somehow analyzing the response object, but I can't figure out how to do it. Any suggestions?</p>