retry from SO

ajax-retry.js

//http://stackoverflow.com/questions/11793430/retry-a-jquery-ajax-request-which-has-callbacks-attached-to-its-deferred
//http://jsfiddle.net/gLedx/2/

$.ajaxPrefilter(function(opts, originalOpts, jqXHR) {
    // you could pass this option in on a "retry" so that it doesn't
    // get all recursive on you.
    if ( opts.retryAttempt ) {
        return;
    }

    var dfd = $.Deferred();

    // if the request works, return normally
    jqXHR.done(dfd.resolve);

    // if the request fails, do something else
    // yet still resolve
    jqXHR.fail(function() {
        if ( jqXHR.status === 404 ) {
            dfd.resolveWith(this, ["I cheated and loaded this from 'cache'"]);
        } else {
            dfd.rejectWith( this, arguments );
        }
    });

    // NOW override the jqXHR's promise functions with our deferred
    return dfd.promise(jqXHR);
});


$.ajax("/not/a/url").done(function(data) {
    console.log("done", this, data);
}).fail(function() {
    console.log("fail", this, arguments);
});