docs: def raw(self, url, extra_headers=None, params=None):
          'Make a GET request for url and return whatever content we get'
          r = self.request(url, extra_headers=extra_headers, params=params)
          # uncomment to dump raw xml
  #         with open('/tmp/%s.xml' % time.time(), 'wb') as f:
  #             f.write(r.content)
  
          if not r.ok:
              o = lxml.objectify.fromstring(r.content)
              JFSError.raiseError(o, url)
          return r.content