Keith's Weblog: Comments on "Testing PRG"

by Keith

Sat, 28 Aug 2004 10:29:49 +0000

testing

by Keith

Sat, 28 Aug 2004 10:30:07 +0000

Testing in Internet Explorer.

by Keith

Sat, 28 Aug 2004 10:31:09 +0000

Testing in Opera.

by Keith

Sat, 28 Aug 2004 10:31:56 +0000

Testing in Opera again.

by Keith

Sat, 28 Aug 2004 10:32:29 +0000

Testing in Opera one more time.

by Keith

Sat, 28 Aug 2004 10:32:46 +0000

Testing in Opera for the last time.

by Keith

Sat, 28 Aug 2004 10:37:15 +0000

Testing with Ethereal so I can try to figure out what Opera's doing.

by Keith

Sat, 28 Aug 2004 10:46:39 +0000

Testing one more time with Ethereal and Opera.

by Keith

Sat, 28 Aug 2004 10:49:05 +0000

And one more time with gzip compression off.

by Arnaud

Tue, 31 Aug 2004 18:50:57 +0000

A possible technique to re-submission is to put a token in a hidden field. If the page is resubmitted you check if the token was used, if you so you don't take into account the user action.

input hidden value=48a24b70a0b376535542b996af517398

on the server you create a file with the name as the value above when the form is submitted. Checking if a file with a name as token value you don't take into account the submission.

by Keith

Tue, 31 Aug 2004 19:04:52 +0000

Arnaud, I know there are many ways to protect against duplicate form submission, but that's only one benefit of the PRG pattern. The main one is getting rid of the "Resubmit this form data?" popup, which also allows you to use the back and forward buttons in your browser despite a form submission.

by Levin

Tue, 31 Aug 2004 20:49:28 +0000

Testing with Opera

by Arnaud

Tue, 31 Aug 2004 22:48:38 +0000

Yes true, I was a bit off topic but it may help some people reading it (who knows

I've noticed though that when using a token I would not get the resubmitted popup though I haven't looked into it too much.

by Ian Bicking

Wed, 01 Sep 2004 05:07:45 +0000

There's a number of 3xx redirect codes, some of them work better than others. I think 303 is the right one for PRG. I've found that other ones work, but sometimes act funny.