Why doesn't it cache?

Question

Okay, i've got a website (https://illution.dk) and almost all of my included/linked files are sending out an "304 Not Modified" header. Except for: https://illution.dk/include/style.php which is always returning an "200 OK". My headers for style.php are:

HTTP/1.1 200 OK => 
Date => Fri, 11 Nov 2011 15:44:39 GMT
Server => Apache/2.2.6 mod_auth_kerb/5.3 PHP/5.2.17 mod_fcgid/2.3.5
X-Powered-By => PHP/5.2.17
Expires => Sat, 12 Nov 2011 16:44:39 CET
Cache-Control => max-age=290304000, public
Pragma => 
Set-Cookie => PHPSESSID=dkh4jdqko9t6ihp760sn4v28a2; path=/; domain=.illution.dk
Last-Modified => Fri, 11 Nov 2011 15:52:18 GMT
Connection => close
Content-Type => text/css

What can the problem be?

Thanks in advance!

Can you also include headers for the files that DO cache?

jlb
– jlb

2011-11-11 15:55:56 +00:00
Commented Nov 11, 2011 at 15:55 — jlb
– jlb, Commented Nov 11, 2011 at 15:55
I know, but I can't do anything about it...

Fredefl
– Fredefl

2011-11-11 16:11:17 +00:00
Commented Nov 11, 2011 at 16:11 — Fredefl
– Fredefl, Commented Nov 11, 2011 at 16:11

airportyh · Accepted Answer · 2011-11-11 16:04:42Z

1

In my test, the browsers sends the If-Modified-Since header

If-Modified-Since:Fri, 11 Nov 2011 15:57:48 GMT

But the page returned has the following modified date

Last-Modified:Fri, 11 Nov 2011 15:58:44 GMT

which is later that the If-Modified-Since date, which means the server side(PHP) thinks it always has a later version than the browser's cached version, causing it to send back the file every time.

answered Nov 11, 2011 at 16:04

airportyh

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1 Comment

Fredefl Over a year ago

Why is the browser sending an "Cache-Control:max-age=0"?

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