Expiry date for Images

[Ammy_769]

Is it something like expiry date of images? I once tested site with YSlow! in chrome and it recommended that your site images have no expiry, what does this mean or I got it wrong. Please share it with me.

Regards.

[sukanjan.k]

Image expiry means adding Expires in header which specifies a time far enough in the future so that clients (browsers) won't try to re-fetch images that haven't changed. That increased the page load time because clients won't try to fetch images every time visiting a site.

[Ammy_769]

Thanks a lot for explaining, can you tell me how to do this? Which code to be put in header?

[sukanjan.k]

Its not so easy as it sounds, I know how to put a Expires HTTP header in a Apache server but can't tell you how to do in a windows server. You can take a look at this apache help doc first, there everything explained about the mod_expires Module.

Code:

http://httpd.apache.org/docs/current/mod/mod_expires.html

Also this can help you...

Code:

http://httpd.apache.org/docs/current/mod/mod_headers.html#header

[Ammy_769]

Thanks a lot. Really worth looking article.

[Ammy_769]

Well, I myself found a good way to do it in PHP, take a look:

Code:

http://www.daniweb.com/web-development/php/threads/192918

and

Code:

http://php.net/manual/en/function.header.php