XMLHttpRequest is deprecated. What to use instead?

Question

Trying to use a pure JS approach to check if I have a valid JS image url. I am getting a warning that XMLHttpRequest is deprecated. What is a better way to do this?

Answer 1

The cause of the warning was that in http.open('HEAD', url, false); you put a third argument (async) as false. As per the https://xhr.spec.whatwg.org/#synchronous-flag it should be set to true.