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David Müller:
Cross Domain AJAX Guide
December 10, 2012 @ 12:17:39

In his latest post David Müller covers some of the things to consider when working with cross-domain ajax requests including CORS and iframes.

As it is widely known, AJAX Requests are only possible if port, protocol and domain of sender and receiver are equal. [...] Having this cleared out, we will cover ways around this restriction.

He covers three main approaches to allowing these cross-domain requests (and some of the security implications that can come with them):

  • CORS (Cross Origin Resource Sharing)
  • JSONP (Javascript with a local domain callback)
  • Iframes

He also briefly mentions things like window.postMessage (HTML5) and the use of a backend script to proxy a request into your application's local code.

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