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Alaska,

Alaska Winter wrote:
| what happens if user hits the back button to catalogue.  Perfectly valid
| thing to do.

If they submit an old (expired) token, then you simply ignore the
request. You will probably want to notify them why the request was
ignored. But in this case, there has been a new roundtrip to the server,
giving you the opportunity to put the new (valid) token into the session.

Another option (which I favor to avoid this type of problem) is to
redirect the client after any operation that should not be accidentally
repeatable.

- -chris
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