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From "Joshua Slive" <>
Subject Re: [users@httpd] Mod_Expires "If-Modified-Since" Problem
Date Sat, 18 Mar 2006 00:09:29 GMT
On 3/17/06, Kishore Jalleda <> wrote:
> Hi,
>      I compiled apache 1.3.34 with mod_expires module, and add the
> configuration in httpd.conf, as follows
> <Directory "/export/htdocs/">
> <IfModule mod_expires.c>
> ExpiresActive on
> ExpiresByType image/gif "access plus 5 hours"
> ExpiresByType image/jpeg "access plus 5 hours"
> ExpiresByType image/jpg "access plus 5 hours"
> ExpiresByType image/png "access plus 5 hours"
> ExpiresByType application/x-shockwave-flash "access plus 5 hours"
> </IfModule>
>  </Directory>
> now when I try to load a page with lot of gif's for first time , i see that
> IE requests all the objects (gif, jpg, css, js etc),
> and I also see a expires header sent by apache, but when I load it the
> second time, i see that the number of packets between apache and IE have
> reduced but , IE still sends requests for *.gif files and apache responds
> with a 200 OK header, and sends all the gif's again, but surprising IE sends
> a If-Modified-Since header for objects like *.js, *.css, even though I
> haveen't included them in the conf, and apache nicely sends back a 304 and
> IE loads them from cache.
> on a test box with the exact conf, when I load a page second time, IE sends
> the If-Modified-Since header with the GET request and apache returns a 304
> not modified header thus IE loads the images not modified from its cache..
> so I am wondering what is happening here, I have tried this conf on 3 to 4
> production boxes but IE never ever sends the If-Modified-Since header with
> the GET request, so that apache can return a 304 not modified......
> is there somehting I am missing, its surprising its working as expected on
> the test box ...

Look at the full set of response headers sent by apache on each box. 
Perhaps on one box its not sending a Last-Modified header (because of
processing by mod_include or something like that).


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