code: def _checkReturnTo(self, message, return_to):
          
          # Check the openid.return_to args against args in the original
          # message.
          try:
              self._verifyReturnToArgs(message.toPostArgs())
          except ProtocolError as why:
              logging.exception("Verifying return_to arguments: %s" % (why, ))
              return False
  
          # Check the return_to base URL against the one in the message.
          msg_return_to = message.getArg(OPENID_NS, 'return_to')
  
          # The URL scheme, authority, and path MUST be the same between
          # the two URLs.
          app_parts = urlparse(urinorm.urinorm(return_to))
          msg_parts = urlparse(urinorm.urinorm(msg_return_to))
  
          # (addressing scheme, network location, path) must be equal in
          # both URLs.
          for part in range(0, 3):
              if app_parts[part] != msg_parts[part]:
                  return False
  
          return True
docs: Check an OpenID message and its openid.return_to value
          against a return_to URL from an application.  Return True on
          success, False on failure.