Legacy JavaScript (IE)

Creating requests using pure JavaScript (“VanillaJS”) in older browsers that do not support ES6+ or the Promise-based fetch() command. This is the case with all versions of Internet Explorer 11 and below.

Check Can I Use for all browsers that do not support fetch().

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Find out, how to create GET, POST, PUT, PATCH and DELETE requests, with and without authentication and file-uploads using nothing but pure JavaScript in the following chapters:

• Basic requests
  • How to make a request with pure JavaScript (no libraries) that supports older browsers (like Internet Explorer 11 and below).
• Authentication
  • How to login as a Frontend-User using pure JavaScript (no libraries) for IE11 and post data to an endpoint
• Uploading Files
  • How to upload files with pure JavaScript for older browsers