[please don't reply to old messages when creating a new topic]


On Thu, Dec 22, 2005 at 07:23:27AM -0800, Antonio Barrera wrote:
> I'm experiencing a situation where .html pages do have a Last Modified 
> Date stored, however, PHP pages (containing static and/or dynamic 
> content) do not have the Date stored.

Your php files are not sending a last modified header.


$ HEAD http://library.princeton.edu/help/unicode.php
200 OK
Connection: close
Date: Thu, 22 Dec 2005 16:09:06 GMT
Server: Apache/2.0.54 (Unix) mod_ssl/2.0.54 OpenSSL/0.9.7a DAV/2
PHP/4.4.0
Content-Type: text/html
Client-Date: Thu, 22 Dec 2005 16:14:26 GMT
Client-Peer: 128.112.206.240:80
Client-Response-Num: 1
X-Powered-By: PHP/4.4.0


-- 
Bill Moseley
moseley@hank.org

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