On Wed, Jun 3, 2015 at 11:58 AM, Sylvain Faivre
<sylvain.fai...@reservit.com> wrote:
> Hello,
>
> I use the redirect directive to redirect users from old sites to a new site,
> eg:
> redirect prefix http://new-site.com code 301 if old-site
>
> I would like to redirect requests from many old sites to the same new site,
> so I need a way to add info about the old host in the new redirected
> request.
>
> I'm looking for a way to add a header to the redirected request to identify
> the host, for example :
> X-Orig-Site: old-site-123.com
>
> Is this possible ?
>
> I guess I can't add a header to the request with HAproxy, since HAproxy only
> sends a new Location header to the browser, and the browser sets the
> headers.
>
> So, is there a way to alter the location sent in the redirect, to include «
> &orig-site=old-site-123.com » ?
>
> I think I'm missing something here.
> Should I user « http-request redirect » instead of « redirect prefix » ?
>
>
> By the way, I tried to use the set-cookie option for this, but it was a bad
> idea :
> redirect prefix http://new-site.com code 301 set-cookie
> ORIG=%[hdr(host)] if old_site
>
> This doesn't work for two reasons :
>
> 1. The « %[hdr(host)] » part is send literally in the request :
> Set-Cookie: ORIG=%[hdr(host)]; path=/;
>
> 2. The request sent to new-site.com doesn't seem to include this cookie
>
>
> Sylvain
>
Hi Sylvain,
The only "good way" to do what you want to achieve, is to use a query
string parameter and http-request and http-response rules coupled to a
few sections...
Basically, haproxy is not able to modify the headers sent by a
redirect rule. So the trick here, is to perform the redirect in a
dummy frontend section used as a server in a dedicated backend and
insert a header in the response, like this:
backend be_redirect
http-request capture req.hdr(host),word(1,:),lower len 32
http-response replace-value Location (.*)
\1&orig-site=%[capture.req.hdr(0)] if { res.hdr(Location) -m sub ? }
http-response replace-value Location (.*)
\1?orig-site=%[capture.req.hdr(0)] if !{ res.hdr(Location) -m sub ? }
server dummy_redirect 127.0.0.1:8001
frontend fe_dummy_redirect
bind 127.0.0.1:8001
http-request redirect prefix http://new-site.com code 301
Note that this configuration needs HAProxy 1.6 (latest snapshot).
Baptiste
