def setup_request
      @request ||= JSONAPI::RequestParser.new(
        params,
        context: context,
        key_formatter: key_formatter,
        server_error_callbacks: (self.class.server_error_callbacks || [])
      )
    end
def setup_request
      @request ||= JSONAPI::RequestParser.new(
        params,
        context: context,
        key_formatter: key_formatter,
        server_error_callbacks: (self.class.server_error_callbacks || [])
      )
    end
Instantiate the request object.

 @return [JSONAPI::RequestParser]

 @api public