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What I do in this case is that I store the parameters of the form, and if I find that I have already received it, I check compare the 2 sets of parameters. If they are identical then no problem, I do not process the second form and just resend the result. If there is a difference I send an error message. What you do in this case really depends on your application. You might want to "undo" the first transaction and process the second one.

Update: I forgot to mention that I store the unique identifier in a hidden parameter. This is certainly not completely secure, as the parameter can be changed and intercepted, but I believe it is OK in my case (malicious users changing the parameter would just loose the session and outside attackers trying to hijack the session would get the error message).

In reply to Re: Re: Preventing Duplicate Form Submissions by mirod
in thread Avoiding a second click by MMilani

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