Do Not Repeat Action on Refresh

[xProteuSx]

I've got a site that passes a few variables from one page to another using an HTML form and the POST method.  These variables are then used to perform an action.

 

Now I am coming up against an issue where if the browser gets refreshed, the action is performed more than once.

 

What is the general protocol to avoid this issue?  Or is there a standard protocol?

[requinix]

General strategy is to redirect someplace after you've handled the form.

1. a.php shows the form

2. Form POSTS to b.php

3. b.php does whatever

4. b.php redirects wherever, like back to a.php or some completely different c.php