Access page header of the current page in javascript [no ajax]

Question

How can I view the page headers of the loaded page using javascript.

Is there something where I can execute a

e.g. window.pageHeaders['session']

Note: I am not talking about a Ajax page load.

Answer 1

Check out this jsfiddle.

Linking from this question.

This answer by Raja will get the page headers for the current page.

var req = new XMLHttpRequest();
req.open('GET', document.location, false);
req.send(null);
var headers = req.getAllResponseHeaders().toLowerCase();
alert(headers);