How to detect HTTP status from JavaScript

Question

I want to detect in a script, which could be deployed beyond my control, whether the page was delivered with a HTTP status of 200, 404 or 500 etc.

This can\'t be don

Answer 1

Have the page make a XMLHttpRequest to itself (using location.href or document.URL) and check the HTTP status you get. Seems to be pretty portable way to me. Why you would do a thing like this is beyond my understanding though ;)