code: def response_schema(schema, code=200, required=False, description=None):
      
      if callable(schema):
          schema = schema()
  
      def wrapper(func):
          if not hasattr(func, "__apispec__"):
              func.__apispec__ = {"parameters": [], "responses": {}}
          func.__apispec__["responses"]["%s" % code] = {
              "schema": schema,
              "required": required,
              "description": description,
          }
          return func
  
      return wrapper
docs: Add response info into the swagger spec
  
      Usage:
  
      .. code-block:: python
  
          from aiohttp import web
          from marshmallow import Schema, fields
  
  
          class ResponseSchema(Schema):
              msg = fields.Str()
              data = fields.Dict()
  
          @response_schema(ResponseSchema(), 200)
          async def index(request):
              return web.json_response({'msg': 'done', 'data': {}})
  
      :param str description: response description
      :param bool required:
      :param schema: :class:`Schema <marshmallow.Schema>` class or instance
      :param int code: HTTP response code