<!DOCTYPE html>
<html>
<head>
<title>bog</title>
</head>
<body>
<script>
function upload() {
var file = document.getElementById('file').files[0];
var ajax = new XMLHttpRequest;
const reader = new FileReader();
ajax.open('POST', '', true);
ajax.overrideMimeType('text/plain; charset=x-user-defined-binary');
reader.onload = function(evt) {
ajax.send(evt.target.result);
};
reader.readAsBinaryString(file);
}
</script>
<input id="file" type="file" />
<input type="button" onClick="upload()" value="Upload">
</body>
</html>