Solving the Double Submission Issue

Question

I would like to see how Web Developers avoid the double submission problem. So basically my understanding of the problem is as follows:

Double submission occurs whe

Answer 1

A real life example would be this answer posted twice ;-). If you don't want to rely on any aspect of the client side (javascript, or even cookies), you can calculate an MD5 hash of the data submitted, possibly by adding information such as source IP and the browser used, and reject posts that have the same hash.