Re: [phplib-dev] possible solution for "data missing" error? From: Spruce Weber (sprucely <email protected>)
Date: 02/28/01

The way I avoid the "Data missing" error is I post forms to a script that
processes the form data and then rather than output any content it redirects
to a different page for actual output. This way no content is ever a
"direct" result of a post, and the browser doesn't ever have to worry about
reposting form data to display a page when someone hits the back button.

----Original Message Follows----
From: Daniel Naber <daniel.naber <email protected>>
To: phplib-dev <email protected>
Subject: [phplib-dev] possible solution for "data missing" error?
Date: Wed, 28 Feb 2001 13:49:02 +0100

Hi,

I wonder if this is a valid solution to the "Data missing" error that
appears when $allowcache is set to "private" and the user presses his back
button to go back to a page that was the result of a POST:

case "private":
$mod_gmt = gmdate("D, d M Y H:i:s", getlastmod()) . " GMT";
header("Last-Modified: " . $mod_gmt);
# dnaber, 2001-02-28, prevent "Data missing" error:
if( getenv("REQUEST_METHOD") == "GET" ) {
   header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
   header("Cache-Control: private");
   header("Cache-Control: max-age=" . $this->allowcache_expire * 60);
   header("Cache-Control: pre-check=" . $this->allowcache_expire * 60);
}
break;

My idea is that proxy caches should not cache POST queries by default.
Does anybody know if that's really the case?

Regards
  Daniel 

--
Daniel Naber, Paul-Gerhardt-Str. 2, 33332 Guetersloh, Germany
Tel. 05241-59371, Mobil 0170-4819674

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