On 06/03/2015 04:02 PM, Baptiste wrote:
On Wed, Jun 3, 2015 at 11:58 AM, Sylvain Faivre
<[email protected]> 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
Hi Baptiste,
Unfortunately, we are not willing to upgrade to HAproxy 1.6 just yet, so
we are going to use another solution for this redirect (change DNS
records to resolve old hostnames to the new web server).
Thank you for the info anyway, it may be useful for another time.
Sylvain
