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respondTo is a jQuery plugin that allows you to supply handlers for different AJAX response content types. In practice, it looks something like this:

$.respondTo({
    url: '/people/37',
    html: function(html, status) {
        // handle HTML response
    },
    json: function(json, status) {
        // handle JSON response
    }
});

The naming bothers me (it looks like it’s adding a route listener instead of making an AJAX request), but it looks pretty useful. The library can also override the existing jQuery AJAX methods, if desired.