here is the example from google (they have set the cache expire far far in the future )
$ curl -I http://www.google.ro/logos/chagall.gif
HTTP/1.1 200 OK
Content-Type: image/gif
Last-Modified: Mon, 07 Jul 2008 04:33:28 GMT
Expires: Sun, 17 Jan 2038 19:14:07 GMT
Cache-Control: public
Date: Mon, 07 Jul 2008 10:09:52 GMT
Server: gws
Content-Length: 16715
here is my configure.nice script for apache 2.2.x
"./configure" \
"--prefix=/opt/apache2.2" \
"--enable-so" \
"--enable-mantainer-mode" \
"--enable-module=all" \
"--enable-rewrite" \
"--enable-include" \
"--enable-info" \
"--enable-expires" \
"$@"
also after all is build and installed (apache server restarted)
you can check the expire config
$/opt/apache2.2/bin/httpd -l | grep expire
or in browser
http://example.com/server-info?mod_expires.c
and add the expire config into the httpd.conf or .htaccess
ExpiresByType text/html "access plus 1 month 15 days 2 hours"
ExpiresByType image/gif "access plus 1 month 15 days 2 hours" you can check later the expire headers with curl
$curl -I http://example.com/images/example.gif
HTTP/1.1 200 OK
Date: Mon, 07 Jul 2008 12:18:14 GMT
Server: Apache/2.2.8 (Unix) PHP/5.2.6
Last-Modified: Tue, 01 Jul 2008 13:57:59 GMT
ETag: "3884a9-2348f-450f6c38087c0"
Accept-Ranges: bytes
Content-Length: 144527
Cache-Control: max-age=3895200
Expires: Thu, 21 Aug 2008 14:18:14 GMT
Content-Type: image/gif
