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Alexander Farber
Asked: 2017-08-28 07:58:18 +0800 CST

Prepend "player-" before numeric URLs with the help of HAProxy 1.5

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I run a web game embedded in Wordpress/Jetty behind HAProxy 1.5 on CentOS 7 Linux.

The website can be accessed both as http and https.

I have modified Wordpress to display player profile pages at the URLs like:

https://slova.de/player-12345

where 12345 is a numeric player id in my web game.

This works well, but I would like to simplify the above URLs to

https://slova.de/12345

and then use HAProxy to prepend the "player-" part to numeric-only paths.

So I have added to /etc/haproxy/haproxy.cfg file the line:

http-request redirect code 301 prefix /player- if { path_end /5 }

This results however in the broken URL for some reason:

https://slova.de/player-/player-/player-/player-/player-/player-/player-/player-/player-/player-/player-/player-/player-/player-/player-/player-/player-/player-/player-/player-/player-/5

Below is my complete haproxy.cfg file to provide more context:

global
    log         127.0.0.1 local2

    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon

    stats socket /var/lib/haproxy/stats

    tune.ssl.default-dh-param 2048

defaults
    mode                    http
    log                     global
    option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/8
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 3000

    # for WebSocket connections
    timeout tunnel          1h
    timeout client-fin      1m

frontend public
    bind 144.76.184.151:80
    bind 144.76.184.151:443 ssl crt /etc/pki/tls/certs/slova.de.pem no-sslv3
    http-request deny if { path_beg /xmlrpc.php }

    http-request redirect code 301 prefix /player- if { path_end /5 }

    default_backend jetty

backend jetty
    server domain 127.0.0.1:8080 send-proxy
redirect

1 Answers

  1. This means you are sending a 301 redirect response to every request that has the number 5 in the end of the URL.

    So, if your first request is for http://www.example.com/5, your configuration would send a HTTP 301 redirect to URL http://www.example.com/player-5. The browser then requests this URL, and HAProxy again sends the HTTP 301 redirect, now to http://www.example.com/player-/player-5 and so on, until some URL length limit is reached.

    I assume that you don't want to do a 301 redirect here, but attach the player- prefix to the request going to Jetty. To make this happen, you need to use the http-request set-path directive.

    However, if you want to do a 301 redirect, then you need to refine your condition so that the redirect is only done when there is no player- prefix in the URL.

    For example, this could work:

    http-request redirect code 301 prefix /player- if { path_end /5 and !path_end /player-5 }

    I haven't used HAProxy myself, so this is only based on the HAProxy documentation and my interpretation on how its ACLs work.

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