RPC for Xsite communication

If I understand it correctly the RPC framework is intended only for same-origin communication and the alternatives to workaround SOP are: using RequestBuilder (XmlHttpRequest) directly or JsonpRequestBuilder (a <script> tag).

The downside with those alternatives is that you lose the automatic serialization magic of the rpc framework which is very sad because these days you can whitelist servers to make XmlHttpRequests safely.

So before going to work directly with RequestBuilder I would like to know if there is a way to enable it for xsite use. I'm assuming that the implementation just uses RequestBuilder behind the scenes and that it would be easy to change it.

Thanks,

José Alejandro

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