title: Python urllib2: Reading content body even during HTTPError exception?
body: <p>I'm using urllib2 to fetch a a page via HTTP.  Sometimes the resource throws a HTTP error 400 (Bad Request) when my request contains an error.  However, that response also contains an XML element that gives a detailed error message.  It would be very handy to be able to see that error rather than just the HTTPError exception returned by urllib2.  </p>
  
  <p>How do I return the document contents in spite of the exception?</p>