    # File lib/action_controller/integration.rb, line 231
          def xml_http_request(request_method, path, parameters = nil, headers = nil)
            headers ||= {}
            headers['X-Requested-With'] = 'XMLHttpRequest'
            headers['Accept'] ||= [Mime::JS, Mime::HTML, Mime::XML, 'text/xml', Mime::ALL].join(', ')
            process(request_method, path, parameters, headers)
          end