Moving a redirect from backend to varnish

[Stig Sandbeck Mathisen]

Kenneth Rørvik <Kenneth.Rorvik at hio.no> writes:

> Kenneth Rørvik wrote:
>
>> Now, provided I get the right test in place - the next question is
>> how to handle the redirect itself. You could either send the request
>> on to 
>
> Looks like the test is OK now. Next problem: piping to the server now
> makes it impossible for the server to distinguish clients (since they
> all come from varnish), so the next Q is:
>
> How can I have varnish itself send a http 301 or 307 to the client
> with the correct URL? Cannot find this documented, or on google for
> that matter.

Varnish adds (or modifies an existing?) X-Forwarded-For header,
containing a path of IP addresses of the client and additional
proxies.

You should be able to use the server-variable %{HTTP_FORWARDED}, or
perhaps %{HTTP_X_FORWARDED_FROM}, for matching the client address with
RewriteCond. 

Note that it is possible for the user to add information to this
header when sending a request.

-- 
Stig Sandbeck Mathisen, Linpro