Problem sending JSON data from JQuery to WCF REST method

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This seems to be a Firefox thing for avoiding cross domain calls. See http://www.petefreitag.com/item/703.cfm

The spec for this is here http://www.w3.org/TR/cors/ and after a very brief read, it appears that because you are doing a cross domain call, your service is expected to implement the OPTIONS method and return some headers that allow the POST method to be sent.

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