How to callback a function on 404 in JSON ajax request with jQuery?

With your configuration jQuery uses jsonp to transport the data. This works by dynamically inserting a script element and setting the URL to the specified value. The data returned by the server is then evaluated as JavaScript - usually calling the provided callback.

If the server returns a 404, the contents is obviously no JavaScript and the callback is never called. Some browsers support error handlers on the script tag, which are called in these situations. Unfortunately IE doens't support this.

The best way to detect an error is to rely on a timeout.

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