add header or query parameter when redirecting

2015-06-03 Thread Sylvain Faivre 

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

Re: add header or query parameter when redirecting

2015-06-03 Thread Sylvain Faivre 

On 06/03/2015 04:02 PM, Baptiste wrote:

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 (.*)
\1orig-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

Re: add header or query parameter when redirecting

2015-06-03 Thread Baptiste 
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 (.*)
\1orig-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

Re: add header or query parameter when redirecting

2015-06-03 Thread 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

Well, HAPEE-1.5-r2 will have this feature and will be available soon.
It's part of the backports from 1.6.
Contact us at http://www.haproxy.com for more information.
Cherry on the cake, you'll have access to our support team in the mean time :)

Baptiste