docs: def prepare(self):
          """Behaves like a middleware between raw request and handling process,
  
          If `PREPARES` is defined on handler class, which should be
          a list, for example, ['auth', 'context'], method whose name
          is constitute by prefix '_prepare_' and string in this list
          will be executed by sequence. In this example, those methods are
          `_prepare_auth` and `_prepare_context`
          """
          if settings['LOG_REQUEST']:
              log_request(self)
  
          for i in self.PREPARES:
              getattr(self, 'prepare_' + i)()
              if self._finished:
                  return