code: def _handle_post(self, request):
          # type: (Post) -> CallbackResponses
          
          method_name = request.path[1]
  
          method = self._block[method_name]
          assert isinstance(method, MethodModel), \
              "Cannot Post to %s which is a %s" % (method.path, type(method))
          self.check_field_writeable(method)
  
          post_function = self.get_post_function(method_name)
          args = method.validate(request.parameters)
  
          with self.lock_released:
              result = post_function(**args)
  
          # Don't need to serialize as the result should be immutable
          ret = [request.return_response(result)]
          return ret
docs: Called with the lock taken