How to display messages to the user after a POST + HTTP redirect

Question

I’m using the PRG pattern to avoid multiple form submission. It has, however, a serious drawback — you cannot simply echo the confirmation message to the user (

Answer 1

I use the session variable method. I don't really like embedding error messages for display in the URL, especially with the URL-saving/sharing issues you note, and I like that if the user reloads the destination page it'll be a clean instance.