Read If-Modified-Since header in PHP CGI

Question

My PHP script depends on being able to read the value of the If-Modified-Since header (yes, I know how to do this).

It worked correctly when I used PHP as mod_php, but now that I've switched to suPHP (CGI), it appears Apache itself handles requests that contain this header, without forwarding them to PHP at all.

This is silly, because Apache can't possibly know when my dynamically generated CSS file (that is what my script makes) is changed. How can I discipline Apache in this regard?

You need to tell us more about the headers you sending. Most likely mod_cache is caching your response for you because you are sending headers that say it can. — docwhat, Dec 30 '09 at 15:24

score -1 · Answer 1 · answered Dec 21 '09 at 23:52

-1

It's located in the variable $_SERVER['HTTP_IF_MODIFIED_SINCE'].

I use it in a script, along with fun stuff like HTTP_IF_MODIFIED_SINCE. ;-)

Ciao!

answered Dec 21 '09 at 23:52

docwhat

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I know that, but Apache does not call PHP at all. – Bart van Heukelom Dec 22 '09 at 00:11
No, it sends back the output it has in it's own cache. – Bart van Heukelom Dec 31 '09 at 18:14
"it" being apache? I don't think apache caches things unless you have mod proxy setup. Are you *sure* it isn't caching in the browser? Can you reproduce this behavior using curl or wget? – docwhat Jan 05 '10 at 17:42

Read If-Modified-Since header in PHP CGI

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