    # File lib/action_controller/integration.rb, line 186
          def xml_http_request(request_method, path, parameters = nil, headers = nil)
            unless request_method.is_a?(Symbol)
              ActiveSupport::Deprecation.warn 'xml_http_request now takes the request_method (:get, :post, etc.) as the first argument. It used to assume :post, so add the :post argument to your existing method calls to silence this warning.'
              request_method, path, parameters, headers = :post, request_method, path, parameters
            end

            headers ||= {}
            headers['X-Requested-With'] = 'XMLHttpRequest'
            headers['Accept'] = 'text/javascript, text/html, application/xml, text/xml, */*'

            process(request_method, path, parameters, headers)
          end