The header on my site script includes the following: header(Expires: Mon, 26 Jul 1997

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Asked: June 5, 20262026-06-05T18:51:57+00:00 2026-06-05T18:51:57+00:00

The header on my site script includes the following: header(Expires: Mon, 26 Jul 1997

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The header on my site script includes the following:

header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");

These lines are called prior to any output/whitespace.

This is what is showing in my live header viewer:

POST /includes/whosonline.php HTTP/1.1
Host: mysite.org
User-Agent: Linux/Firefox 11
Accept: text/javascript, text/html, application/xml, text/xml, */*
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
X-Requested-With: XMLHttpRequest
X-Prototype-Version: 1.6.0.2
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Referer: https://mysite.org?id=123
Content-Length: 0
Cookie: [cookie stuff removed]
Pragma: no-cache
Cache-Control: no-cache

Note that the headers of the script specify that the browser not cache the page. The Expires date is before the current date.

Why is this not working?