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Editorial Team
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Asked: 2026-06-17T18:37:45+00:00

I have an haproxy 1.4 installed and I need to configure a reverse proxy

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I have an haproxy 1.4 installed and I need to configure a reverse proxy in haproxy.conf that rewrites a URL from www.somedomain.com to www.otherdomain.com/bla/ble. the configuration that I am writing is here:

acl                     cpol_acl hdr_dom(host) -i www.somedomain.com
use_backend             cpol_srv if cpol_acl


backend cpol_srv
    balance                 leastconn
    mode                    http
    option                  httplog
    stick                   on src
    stick-table             type ip size 10240k expire 60m
    reqirep                 ^([^\ :]*)\ /(.*)       \1\ /bla/ble\2
    reqirep                 ^Host:\ www.somedomain.com Host:\ www.otherdomain.com
    server                  cpol_srv www.otherdomain.com check port 80

This is working but the URL in the browser does rewrite to www.otherdomain.com/bla/ble and that’s not what I want. If I remove the line

reqirep                 ^([^\ :]*)\ /(.*)       \1\ /bla/ble\2

I only can forward to the host www.otherdomain.com but the URL in the browser stays with www.somedomain.com.

Is there any way of doing this types of reverse proxy without rewriting the browser URL?

PS: I would do this Apache style (which works) but the machine does not have any NAT to the world outside, and can only communicate to haproxy.

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1 Answer

  1. Editorial Team

    Well, after a while I figured out what has to be done.

    It’s not sufficient to change only the request but also have to change the response back to the original requesting host. It was also made an acl to prevent repetition of the directory url part “/bla/ble”. Sticking to the example above this should be done like so:

        acl                     cpol_acl hdr_dom(host) -i www.somedomain.com
    use_backend             cpol_srv if cpol_acl


backend cpol_srv
    balance                 leastconn
    mode                    http
    option                  httplog
    stick                   on src
    stick-table             type ip size 10240k expire 60m
    **acl                     no_redir url_beg   /bla/ble/**

    reqirep                 ^Host:\ www.somedomain.com Host:\ www.otherdomain.com
    reqirep                 ^([^\ :]*)\ /(.*)       \1\ /bla/ble\2   **if !no_redir**


    **rspirep                 ^([^\ :]*)\ (.*)www.otherdomain.com/bla/ble/(.*)    \1\ \2www.somedomain.com/\3**

    server                  cpol_srv www.otherdomain.com check port 80
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