On 25.08.2011 15:00, Andreas wrote:
Am 25.08.2011 11:01, schrieb John Black:
True, a SESSION can be reset by closing the browser but I am not
trying to deny a user from submitting different information again. I
want to prevent them from submitting the same data again by accident
(back button or refresh).
what about storing an md5 of the message body in the db?

Sure you can do all kinds of things with a database but I try to avoid unnecessary connection to the db because they are expensive. It all comes down to how badly you want to prevent the same message to be sent twice.

I have seen bots submit the same message from multiple IPs and some will even modify the message a bit by adding some random data to the end. So I am not sure how effective a simple md5 check will be.

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