I have a problem with HAProxy server. I want to forward in header a client IP. I almost done it, but there is interesting case and I can't figure it out. I need to write client IP in 2 places in header, in X-CLIENT-IP and X-FORWARDED-FOR tag's.

The problem is: When I use

option http-server-close
option forwardfor

On target server I see in header X-FORWARDED-FOR=xxx.xxx.xxx.xxx(client ip) but there is no x-client-ip header.

When I use:

option forwardfor header X-Client-IP
option http-server-close

On target server I see header X-CLIENT-IP=xxx.xxx.xxx(client IP) but X-FORWARDED-FOR=xxx.xxx.xxx.xxx(HAProxy ip)

I need to see on target header where X-CLIENT-IP and X-FORWARDED-FOR has value of client IP.

I try to mix configurations like

 option forwardfor
 option forwardfor header X-Client-IP
 option http-server-close

No efect. I can not also install any modules. The target is IIS.

Any ideas? :(


You can try setting up custom header, like this:

http-request set-header X-Client-IP %[src]

Or, you can even copy it from X-Forwarded-For header, I think syntax would go something like:

http-request set-header X-Client-IP req.hdr_ip([X-Forwarded-For])
  • Second option give me in header x-client-ip=req.hdr_ip(%5bX-Forwarded-For%5d), so something is wrong. But I'l try first one. – KacproSo Sep 15 '15 at 9:17
  • First resolution http-request set-header X-Client-IP %[src] works perfect. – KacproSo Sep 15 '15 at 10:21

If you want to use both, you'll need to add the second with an http-request keyword.

option forwardfor
http-request add-header X-CLIENT-IP %[src]

Suggested answer above that did not work for KacproSo just needed to read the value by adding &[...], so this should work fine:

http-request set-header X-Client-IP %[req.hdr_ip([X-Forwarded-For])]

Your can install a module called mod_rpaf on your backend server(s). This copies the X-FORWARDED-FOR IP to the X-CLIENT-IP. For more information see this. On Windows you should have similar modules, something like X-Forwarded-For ASAPI filters.

  • He cannot install any modules.. – neutrinus Sep 14 '15 at 11:47

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