How can I handle errors in loading an iframe?

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To detect whether your server is down or not, you can include an empty script file from your own domain. When the server is down, the onerror event handler will fire:

var el = document.createElement('script');
el.onerror = errorFunction;
el.src = "https://stackoverflow.com/questions/3705083/somebogusscript.js?" + new Date().getTime();
document.body.appendChild(el);

Note: don’t forget to add a random string to the src attribute to avoid the client using a cached version (which could stop a look at the server at all).

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