On Wed, May 22, 2013 at 7:21 AM, Michael Weiser <
m.wei...@science-computing.de> 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
