[wp-trac] [WordPress Trac] #3027: 404 error pages should be forced to not cache

[WordPress Trac]

#3027: 404 error pages should be forced to not cache
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 Reporter:  _ck_         |       Owner:  anonymous
     Type:  enhancement  |      Status:  new      
 Priority:  low          |   Milestone:  2.1      
Component:  Template     |     Version:  2.0.4    
 Severity:  minor        |    Keywords:           
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 I am not certain if this is an internal WP issue but it should at least be
 used/demonstrated in the default theme 404.php template (more accurately,
 the header since that's where it has to be fixed).

 WP sets regular headers for the 404 error page and this causes most
 browsers to cache it. So if someone adds a post or fixes whatever issue
 that cause the url to be invalid, the error doesn't go away unless they
 realize they need a hard refresh (an easy oversight).

 The following code example will prevent the issue in the template
 header.php but there may be a better way to do it?

 {{{
 <?
 if (is_404()) {
 header("HTTP/1.1 404 Not Found");
 header ("Pragma: no-cache"); // HTTP 1.0
 header ("Expires: Mon, 25 Jul 1995 05:00:00 GMT"); // Date in the past
 header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); // always
 modified
 header ("Cache-Control: no-store, no-cache, must-revalidate"); // HTTP 1.1
 header ("Cache-Control: post-check=0, pre-check=0", false); // HTTP 1.1
 // echo "\n<!--\n"; print_r($_REQUEST); echo "\n-->\n";
 }
 ?>
 }}}

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Ticket URL: <http://trac.wordpress.org/ticket/3027>
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