parse.com - JavaScript: Combile / Simplify multiple ajax Requests -

i building service app , requires multiple request, there common way combine services, have @ least 26 services on queue. here first two? preferred process guarantee error handling? set high timeouts each call? suggestion appreciated.

/*  ////////////////////////////////////////////////////////////////////// objectivesgoals  */ parse.cloud.httprequest({     method: 'get',     url: serverdomain + '/classes/objectivesgoals',     headers: {         'content-type': 'application/json',         'x-parse-application-id': appid,         'x-parse-rest-api-key': restid,         'x-parse-session-token': sessiontoken     } }).then(function (httpresponse) {     var createobjectives = json.parse(httpresponse.text);     var objectives = createobjectives.results;     constructpage();     response.success('hi again'); }, function (httpresponse) {     console.error('request failed response code ' + httpresponse); });  /* ////////////////////////////////////////////////////////////////////// achievements */ parse.cloud.httprequest({     method: 'get',     url: serverdomain + '/classes/achievements',     headers: {         'content-type': 'application/json',         'x-parse-application-id': appid,         'x-parse-rest-api-key': restid,         'x-parse-session-token': sessiontoken     }  }).then(function (httpresponse) {     var createachievements = json.parse(httpresponse.text);     var achievements = createachievements.results;     constructpage();     response.success('hi again'); }, function (httpresponse) {     console.error('request failed response code ' + httpresponse); });