Allow Cross-Origin requests in webservice/upload.php (backport of MDL-60302)

As admin, enable "Mobile services": Site administration ► Mobile app ► Mobile settings Create a Token in the mobile app service for one user: Click on Site administration ► Plugins ► Web services ► Manage tokens Unzip the attached zip file Edit the unzipped js/script.js file, look for the line starting by oXHR.open('POST', and change the Moodle URL with your one, replace the token with the token generated in step 2 Open the unzipped index.html in a browser Upload a file via the index.html form and check that you receive a JSON response where you will be able to find attributes like the draft itemid, filename, contextid, userid and other values If you try to upload a file without the patch applied you will get an error