Content negotiation via XMLHttpRequest

gistfile1.js

// This will change every link on a page with a *type* attribute
// to go through XMLHttpRequest, setting the Accept header, so
// that content negotiation can be used to get an alternate
// content type without having to put the content type in the URL.

$("a[type]").click(
    function() {
        $.ajax({
            url: $(this).attr("href"),
            async: false,
            xhr: function() {
                var x = new XMLHttpRequest();
                x.setRequestHeader("Accept", $(this).attr('type'));
                return x;
            }
        });
        return false;
    }
);