GWT Google Gadget RPC call fails with StatusCodeException (status code: 0)

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Hi,

I have a Google Gadget that is trying to make an RPC call (standard
GWT RPC). The endpoint URL for the service is correct.

When debugging in Firebug, I get the following:

The client seems to send an OPTIONS with the endpoint URL to the
server, which returns the correct response: headers with POST.

I then never see a POST.

In the code itself, the RPC callback gets a failure,
StatusCodeException. The status code is 0.

I am stumped. Anyone's run into this?

Thanks,
Benjamin

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I should also add that this is on an igoogle page.