Re: Expiring other resources with HTTP headers

William said:

That's not exactly what I am looking for. That would cause the JavaScript file to be requested to the web server every single time. I just want the browser to request the file only when it have been modified on the server. Let's say that by default, those JavaScript files expires every 4 hours and that when a PHP program regenerates the file in the server it should, somehow, notify the web browser that the file changed and that it should request that file the next time it reloads the page or else the user will be seeing an outdated menu. I am almost sure this is not posible using HTTP headers. The only way I see this could be achieved is by sending some random parameter to the JS file so that the browser thinks it is a different file. This was suggested by David Tulloh in a previous email.

William: I may not understand what you're trying to do -- but, perhaps using something like: <?php echo "Last modified: " . date ("F d Y H:i:s.", getlastmod());?> In concert with what I suggested might work. tedd ps: your email address has generated a couple of bounced blog stuff thus far.

William:

Include this: <?php # nocache.php // this script prevents all caching // expires on any past date header ("Expires: Mon, 26 Jul 1997 05:00: GMT"); // last modified at current date and time header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT"); // for HTTP 1.1: header ("Cache-Control: no-store, no-cache, must-revalidate"); header ("Cache-Control: post-check=0, pre-check=0", false); // for HTTP 1.0 header ("Pragma: no-cache"); ?> HTH's tedd -- -------------------------------------------------------------------------------- http://sperling.com

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