How to send byte array from javascript to java servlet through ajax

Question

I have a byte array in front-end generated by javascript that I want to send to java servlet through ajax. How can I do that?

Answer 1

See this q&a which discusses a jquery solution but also offers a vanilla js solution

var bytesToSend = [253, 0, 128, 1],
bytesArray = new Uint8Array(bytesToSend);
var xhr = new XMLHttpRequest();
xhr.open('POST', '%your_service_url%');
xhr.setRequestHeader('Content-Type', 'application/octet-stream');
xhr.send(bytesArray);