How do I set a default Header for all XMLHTTPRequests

Question

Problem description

We are running a Kibana 4.3 service. I do not want to modify the source code.

The objective is add an encrypted token, call

Answer 1

I was searching for solution for this problem as well but couldn't find anything and then I came up with next solution:

        XMLHttpRequest.prototype.origOpen = XMLHttpRequest.prototype.open;
        XMLHttpRequest.prototype.open   = function () {
            this.origOpen.apply(this, arguments);
            this.setRequestHeader('X-TOKEN', 'the token');
        };