Check if a WS call is running and return the ongoing promise if it is

Run the following code in console and check that both "Success" are written to console. Go to Network tab and check that only 1 request was done. var $mmSite = angular.element(document.querySelector('[ng-app]')).injector().get('$mmSite'), data = {userid: $mmSite.getUserId()}, preSets = {getFromCache: false};   $mmSite.read('core_enrol_get_users_courses', data, preSets).then(function(courses) { console.log('Success', courses.length); }); $mmSite.read('core_enrol_get_users_courses', data, preSets).then(function(courses) { console.log('Success', courses.length); }); Execute it again to see the request is done again. Run the following code in console and check that two heads are retrieved only once with different result: var $mmWS = angular.element(document.querySelector('[ng-app]')).injector().get('$mmWS'); $mmWS.getRemoteFileSize('http://i.telegraph.co.uk/multimedia/archive/03589/Wellcome_Image_Awa_3589699k.jpg').then(function(data) { console.log('FileSize ' + data); }); $mmWS.getRemoteFileMimeType('http://i.telegraph.co.uk/multimedia/archive/03589/Wellcome_Image_Awa_3589699k.jpg').then(function(data) { console.log('MimeType ' + data); });