docs: def check_token(request):
      """
      Resource check is token valid.
      ---
      request_serializer: serializers.CheckToken
      type:
          username:
              required: true
              type: string
              description: token related user
  
      responseMessages:
          - code: 200
            message: Token is valid
  
          - code: 400
            message: Token is not valid
  
          - code: 401
            message: Unauthorized
      """
      serializer = serializers.CheckToken(data=request.data)
      serializer.is_valid(raise_exception=True)
      token = serializer.validated_data['token']
      logger.debug('Token correct', extra={'token': token, 'username': token.user.username})
      return Response({'username': token.user.username})