Calling an url if the active server is down

@sali wrote:

Hello,

Is there any options to call an url (http) from ha-proxy config once it detects that the active server is down and before it starts serving backup servers? For example, I’m playing with the following config. The frontend is at 8085. LS1/GS1 are active servers and once they are down, it will start serving LS2/GS2. What I need it from is to call an url once haproxy detects that LS1 is down.

defaults
    log     global
    mode    tcp
    option  tcplog
    option  dontlognull
    timeout connect 20s 
    timeout client  20s
    timeout server  20s
    
listen stats
    bind 127.0.0.1:8084
    mode http
    log global
    stats enable
    stats realm Haproxy\ Statistics
    stats uri /

listen LS
    bind 127.0.0.1:8085
    balance roundrobin
    option clitcpka
    option  tcplog
    option  dontlognull
    server LS1 127.0.0.1:20001 check inter 2s fall 2 rise 99999999
    server LS2 127.0.0.1:20011 check inter 2s backup

listen GS
    bind 127.0.0.1:8086
    balance roundrobin
    option clitcpka
    option  tcplog
    option  dontlognull
    server GS1 127.0.0.1:20006 check inter 2s fall 2 rise 99999999
    server GS2 127.0.0.1:20016 check inter 2s backup

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