regarding the HTTP/ 1.0 thing - i simply
tried both configurations in the Advanced section of IE's Internet options.
btw, it had no impact on behaviour.
i created the test.html page and ran
it only to get the same results:
HTTP/1.1 304 Not Modified
Date: Wed, 24 Oct 2007 14:37:28
GMT
Server: Apache/2.2.4 (Win32) mod_jk/1.2.25
ETag: "8e5a-782-8f6da00"
Expires: Wed, 31 Oct 2007 14:37:28
GMT
Cache-Control: max-age=604800
Note that the "Pragma: no-cache"
Header is actually contained in the second request header - not the
response header. for some reason it originates from the browser. very weird...
Uri .
solprovider@xxxxxxxxxx Sent by: solprovider@xxxxxxxxx
24/10/2007 15:46
Please respond to
users@xxxxxxxxxxxxxxxx
To
users@xxxxxxxxxxxxxxxx
cc
Subject
Re: Avoiding conditional
requests
Why is the client sending "HTTP/1.0"? MSIE
6.0 and modern browsers
should be sending "HTTP/1.1".
Why does the response contain the Header "Pragma: no-cache"?
That
implies something is telling the client that the graphic should not
depend on the cache. The JSP is probably setting the no-cache for
the
page (as an HTTP Header or an HTML Head META HTTP-EQUIV command) and
the child requests inherit the setting.
!!! Test with a static no-querystring URL:
http://qcxp2/mytestpage.html
FILE testpage.html:
<HTML><BODY><IMG SRC="">
I rewrote the cache functions for Lenya to bypass caching when a
querystring exists because a querystring may completely change the
response:
/homepage
/homepage?ShowTheLoginScreen
Some software noticing the presence of the querystring may set "no-cache".
solprovider
On 10/24/07, uri_shaked@xxxxxxxxxxxxxxxxx <uri_shaked@xxxxxxxxxxxxxxxxx>
wrote:
> That was the first place I turned to as well, but the browser is actually
set to the default setting - "Automatically".
> another reason i think this is not a browser issue is the fact that
I've also tested this on firefox and on ie7 - both set to default cache
settings and the latter being on a fresh xp installation VM machine.
> In all cased I'm seeing these recurring conditional requests.
> I guess I wanted to verify that the response code apache is returning
looks as is should - the kind that should actually achieve the purpose
i talked about.
>
> Uri.
>
> solprovider@xxxxxxxxxx 24/10/2007 14:06
>
> Check your browser settings:
>
> Internet Explorer 6.0 - Tools - Internet Options - General -
Temporary
> Internet Files - Settings - Check for newer versions of stored
pages:
> __ Every visit to the page
> __ Every time you start Internet Explorer
> __ Automatically
> __ Never
>
> Mozilla 1.7.3 - Edit - Preferences - Advanced - Cache - Compare
the
> page in the cache to the page on the network:
> __ Every time I view the page
> __ When the page is out of date
> __ Once per session
> __ Never
>
> The server-specified expiration period should only affect MSIE's
> "Automatically" and Mozilla's "When the page
is out of date" options.
> As a web developer, you are very likely to have set your browser
to
> the top most-frequently-updated setting to force the appearance
of
> changes from your current work (and may still sometimes need
to
> manually clear the cache.) The "every time"
settings will send the
> conditional request for every request while ignoring expiration
> datetimes.
>
> You can see the Expires header so you know the server is configured
as
> you desire. Your browser must be configured to use the
setting to
> prove your browser works as desired.
>
> solprovider
>
> On 10/24/07, uri_shaked@xxxxxxxxxxxxxxxxx <uri_shaked@xxxxxxxxxxxxxxxxx>
wrote:
> > I've been trying to improve my webapp's performance by
telling Apache
> > [2.2.4] to force clients to cache static content using
mod_expires.
> > I'm basically trying to avoid having the client browser
resend the
> > 'if-modified' conditional request for the static content
upon a refresh or a
> > revisit to the site, thus saving the round-trip time and
having the page
> > presented straight from cache . For this, I've added the
following lines to
> > my httpd.conf:
> >
> > LoadModule expires_module modules/mod_expires.so
> > ExpiresActive on
> > ExpiresDefault "access plus 2 hours"
> > ExpiresByType image/gif "access plus 7 days"
> > ExpiresByType image/jpeg "access plus 7 days"
> > ExpiresByType text/css "access plus 7 days"
> > ExpiresByType application/x-_javascript_ "access plus
12 hours"
> >
> > The problem is that for some reason this doesn't seem to
work, and the
> > browser [ie6] still sends the conditional requests, disregarding
the
> > expiration directive.
> > here is an example HTTP traffic caputre (using Fiddler):
> >
> > First Request
> >
> > GET /Eip/Static/Images/Logos/siteLogo.gif HTTP/1.0
> > Accept: */*
> > Referer: http://qcxp2/Eip/bin/ibp.jsp?ibpPage=HomePage&
> > Accept-Language: he
> > Proxy-Connection: Keep-Alive
> > User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows
NT 5.1; SV1;
> > InfoPath.1; FDM; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)
> > Host: qcxp2
> > Cookie: JSESSIONID=4662B8AA7EC6B9AE09258672CBDCE54C
> >
> > First Response
> >
> > HTTP/1.1 200 OK
> > Date: Wed, 24 Oct 2007 08:37:29 GMT
> > Server: Apache/2.2.4 (Win32) mod_jk/1.2.25
> > Last-Modified: Mon, 17 Sep 2007 09:00:24 GMT
> > ETag: "8e5a-782-8f6da00"
> > Accept-Ranges: bytes
> > Content-Length: 1922
> > Cache-Control: max-age=604800
> > Expires: Wed, 31 Oct 2007 08:37:29 GMT
> > Connection: close
> > Content-Type: image/gif
> >
> > GIF89a]
> >
> > Second Request (the one that souldn't actually occur at
all)
> >
> > GET /Eip/Static/Images/Logos/siteLogo.gif HTTP/1.0
> > Accept: */*
> > Referer: http://qcxp2/Eip/bin/ibp.jsp?ibpPage=HomePage&
> > Accept-Language: he
> > Proxy-Connection: Keep-Alive
> > If-Modified-Since: Mon, 17 Sep 2007 09:00:24 GMT
> > If-None-Match: "8e5a-782-8f6da00"
> > User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows
NT 5.1; SV1;
> > InfoPath.1; FDM; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)
> > Host: qcxp2
> > Pragma: no-cache
> > Cookie: JSESSIONID=4662B8AA7EC6B9AE09258672CBDCE54C
> >
> > Second Response
> >
> > HTTP/1.1 304 Not Modified
> > Date: Wed, 24 Oct 2007 08:41:12 GMT
> > Server: Apache/2.2.4 (Win32) mod_jk/1.2.25
> > Connection: close
> > ETag: "8e5a-782-8f6da00"
> > Expires: Wed, 31 Oct 2007 08:41:12 GMT
> > Cache-Control: max-age=604800
> >
> > Any ideas?
> > Uri
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