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From Yehuda Katz <>
Subject Re: [users@httpd] Interaction of mod_headers and mod_expires
Date Wed, 22 May 2013 13:07:36 GMT
On Wed, May 22, 2013 at 7:21 AM, Michael Weiser <> wrote:

> RewriteEngine on
> RewriteCond %{REQUEST_URI} !/browser_not_supported/
> RewriteCond %{HTTP_USER_AGENT}
> ^Mozilla/4\.0\s*\(compatible;\s*MSIE\s*(1|2|3|4|5|6|7|8)\.(?!.*IEMobile)
> RewriteRule (.*) /browser_not_supported/index.html [R=302,L]
> Both work fine by themselves. Unfortunately, the 302 redirect generated
> by the rewrite rule also gets Cache-Control and Expires headers like this:
> < Cache-Control: max-age=86400
> < Expires: Thu, 23 May 2013 11:03:00 GMT
> This makes some proxies cache the redirect. When the user then starts
> her supported browser and connects to the site again, the proxy will
> serve her the same redirect again and thus redirect the supported
> browser to the browser-not-supported page as well.
> Is mod_expires supposed to work in conjunction with mod_headers?

You need to add *Vary: User-Agent *to tell the proxy that the server
returns different content depending on the user agent.
You could add something like this:
# Make sure proxies don't deliver the wrong content
Header append Vary User-Agent

I will not comment on whether this is the "right" way to do this. Some
might suggest using Javascript browser feature detection instead.

- Y

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