def set_request_body!(request)
      case @request_format
        when :json then request.body = (camelize_keys! @body).to_json
        when :form then request.set_form_data @body
        when :file then request.body_stream = @body
      end if @body
    end
def set_request_body!(request)
      case @request_format
        when :json then request.body = (camelize_keys! @body).to_json
        when :form then request.set_form_data @body
        when :file then request.body_stream = @body
      end if @body
    end
Adds the request body to the request in the appropriate format.
 if the request body is a JSON Object, transform its keys into camel-case,
 since this is the common format for JSON APIs.