Post data to JsonP

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It is not possible to do an asynchronous POST to a service on another domain, due to the (quite sensible) limitation of the same origin policy. JSON-P only works because you’re allowed to insert <script> tags into the DOM, and they can point anywhere.

You can, of course, make a page on another domain the action of a regular form POST.

Edit: There are some interesting hacks out there if you’re willing to go to a lot of effort inserting hidden <iframe>s and mucking about with their properties.

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