Long Polling (aka server push) with JsonpRequestBuilder?

Hi,
I am trying to implement server push using the idea described here,
http://code.google.com/p/google-web-toolkit-incubator/wiki/ServerPushFAQ

While I have read that one must keep the outbound connection down to
two, I cannot seem to be able to have two simultaneous requests from
JsonpRequestBuilder succeed.

I use httpfox, and both requests return successfully with their json
data, but GWT will throw a SocketTImeoutException for the 2nd
request. The same request is successful if there I am not doing my
"polling" in another request.

Here's the step process:
1) Make a request #1 using JsonpRequestBuilder. The server "waits".
2) Make a request #2 JsonpRequestBuilder. The server responds
(according to httpfox) successfully.
3) GWT reports a com.google.gwt.jsonp.client.TimeoutException for the
request #2
4) Request #1 completes successfully (both httpfox and GWT)

Any thoughts?
Thanks for reading,
Phillip

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