JavaScript

check if array contain

       if (data.roles.indexOf('Tenant') !== -1) {
           $scope.tenantRole = true;
           console.log('Tenant gefunden');
       } else {
           console.log('Tenant nicht gefunden');
       }

Options Request

Types of CORS requests

Cross-origin requests come in two flavors: 

simple requests
"not-so-simple requests" (a term I just made up)
Simple requests are requests that meet the following criteria:
HTTP Method matches (case-sensitive) one of:
HEAD
GET
POST
HTTP Headers matches (case-insensitive):
Accept
Accept-Language
Content-Language
Last-Event-ID
Content-Type, but only if the value is one of:
application/x-www-form-urlencoded
multipart/form-data
text/plain