Simulate file upload to server from JS?

Question

JavaScript

Hello!
My goal is to compose in JS and send a POST request to the server, uploading a file, the contents of which will not be taken from the user's disk, but generated in JS.
I don’t quite understand what should be used for this - xmlhttprequest or is there something more high-level?
PS The specific goal is to applaud an image created on canvas through the VKontakte API.

Answer 1

Yes XHR. Form a multipart request.
Only an underwater cobblestone awaits you: you will have to send binary data, and not all browsers can send them with XHR.