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I may be wrong in assuming this, but if I've set an expires header of access plus 1 year on a file, and I can see that in the header, when I make another request for that file, shouldn't it just be cached in the browser so I never actually see the request on the server?

I have these response headers on an img:

Date:Mon, 05 Jul 2010 16:17:08 GMT
Expires:access plus 1 year
Keep-Alive:timeout=15, max=98
Server:Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny6 with Suhosin-Patch

But when I refresh, I still see the request to that image in my apache access log. Is that the expected behaviour? I figured the request would never even make it to my server.

BTW this is what i'm using to set expires headers:

RewriteCond %{REQUEST_FILENAME} ^\/(images|assets|pdfs) [NC]
RewriteRule ^(.*)$ $1 [E=set_expires_header:true,L]
Header add Expires "access plus 1 year" env=set_expires_header
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2 Answers 2

up vote 0 down vote accepted

Check out the documentation for mod_expires. It has a feature ExpiresByType which will save you the mod_rewrite rule. It also has support for your English verbiage to add the expires header based on access time. I don't believe mod_headers is smart enough to figure out what you mean by what you typed, so BMDan is correct in the date format.

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Unfortunately, that's not a valid Expires header. See , and specifically, , which defines an "HTTP-date".

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