When you access /foo, the server will redirect the client to /foo/ (because it is a directory). At the redirected page, the post data will not be sent again by the browser thus there are no _POST values.
Try using action="/foo/". That may work.
Yes, /foo/ does work.
The explanation makes sense.
Bugger! All that time spent banging my head against the wall. :-)
Thanks!
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