code: def get(self):
          
          head = self.request.headers
          name = self.get_argument('name')
          if self.auth.allow_connect(head):
              if 'source_id' in head:
                  cat = self._cache.get(head['source_id'])
              else:
                  cat = self._catalog
              try:
                  source = cat[name]
              except KeyError:
                  msg = 'No such entry'
                  raise tornado.web.HTTPError(status_code=404, log_message=msg,
                                              reason=msg)
              if self.auth.allow_access(head, source, self._catalog):
                  info = source.describe()
                  info['name'] = name
                  source_info = dict(source=info)
                  self.write(msgpack.packb(source_info, use_bin_type=True))
                  return
  
          msg = 'Access forbidden'
          raise tornado.web.HTTPError(status_code=403, log_message=msg,
                                      reason=msg)
docs: Access one source's info.
  
          This is for direct access to an entry by name for random access, which
          is useful to the client when the whole catalog has not first been
          listed and pulled locally (e.g., in the case of pagination).