code: def create_controller(self):
          
          body = None
          req = self.request
          res = self.response
          rou = self.router
          con = None
  
          controller_info = {}
          try:
              controller_info = rou.find(req, res)
  
          except IOError as e:
              logger.warning(str(e), exc_info=True)
              raise CallError(
                  408,
                  "The client went away before the request body was retrieved."
              )
  
          except (ImportError, AttributeError, TypeError) as e:
              exc_info = sys.exc_info()
              logger.warning(str(e), exc_info=exc_info)
              raise CallError(
                  404,
                  "{} not found because of {} \"{}\" on {}:{}".format(
                      req.path,
                      exc_info[0].__name__,
                      str(e),
                      os.path.basename(exc_info[2].tb_frame.f_code.co_filename),
                      exc_info[2].tb_lineno
                  )
              )
  
          else:
              con = controller_info['class_instance']
  
          return con
docs: Create a controller to handle the request
  
          :returns: Controller, this Controller instance should be able to handle
              the request