tasks/datadriver.js
function(callback) {

                if (tunnel) {
                    return callback(null);
                }

                grunt.log.debug('checking if selenium is running');

                var options = {
                    host: capabilities.host || 'localhost',
                    port: capabilities.port || 4444,
                    path: '/wd/hub/status'
                };

                http.get(options, function() {
                    grunt.log.debug('selenium is running');
                    isSeleniumServerRunning = true;
                    callback(null);
                }).on('error', function() {
                    grunt.log.debug('selenium is not running');
                    callback(null);
                });

            }
function(callback) {

                if (tunnel) {
                    return callback(null);
                }

                grunt.log.debug('checking if selenium is running');

                var options = {
                    host: capabilities.host || 'localhost',
                    port: capabilities.port || 4444,
                    path: '/wd/hub/status'
                };

                http.get(options, function() {
                    grunt.log.debug('selenium is running');
                    isSeleniumServerRunning = true;
                    callback(null);
                }).on('error', function() {
                    grunt.log.debug('selenium is not running');
                    callback(null);
                });

            }
function ( callback ) { if ( tunnel ) { return callback ( null ) ; } grunt . log . debug ( 'checking if selenium is running' ) ; var options = { host : capabilities . host || 'localhost' , port : capabilities . port || 4444 , path : '/wd/hub/status' } ; http . get ( options , function ( ) { grunt . log . debug ( 'selenium is running' ) ; isSeleniumServerRunning = true ; callback ( null ) ; } ) . on ( 'error' , function ( ) { grunt . log . debug ( 'selenium is not running' ) ; callback ( null ) ; } ) ; }
check if selenium server is already running
check if selenium server is already running