The twitter callback feature is nice – it makes it extremely easy to to add a twitter feed to a page. But to get the most benefit out of it, you really need to understand what it’s doing.

We’re going to look at how AJAX security works, specifically the Same Origin Policy, how Twitter gets around it, and the type of callback that twitter uses.

Note: the callback that twitter uses is entirely different from callback in the sense of passing a javascript function around as a variable. We’ll look at that in a future article.

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