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

I recently found how to do it (credits to : hunlock)

AJAX.getAllResponseHeaders() -- returns as a string all current headers in use. AJAX.getResponseHeader("headerLabel") -- returns value of the requested header.