I'm trying to develop a data source inside App Engine, but I'm not
even able to get the request I expect from the client.

It seems as though the Query.send(callback) isn't including the
callback parameter in the request to the server.

If I use the APIs Playground example at

http://code.google.com/apis/ajax/playground/?type=visualization#data_source_request

and just change the domain of the data source in line 3 from
'spreadsheets.google.com' to a server I control, I see this in the
logs for the request sent by the query.send(handleQueryResponse) on
line 7:

GET /tq?key=pCQbetd-CptGXxxQIG7VFIQ&range=B1:D11&pub=1&tqx=reqId%3A0
HTTP/1.1

I was sort of expecting to see a requestHandler parameter somewher in
that request.

Maybe I'm misunderstanding the docs here:
http://code.google.com/apis/visualization/documentation/dev/implementing_data_source.html#requestformat

Note that I see the same thing with the pre-release Vis 1.1

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