HAProxy Settings for blockscout.com Routing

#Check for network type
...
acl is_myorg path_beg -i /myorg

# default redirect
redirect prefix /poa/xdai if !is_websocket !is_poa !is_etc !is_eth !is_lukso !is_rsk !is_myorg !is_cookie

#redirect for networks
redirect prefix /poa/core if !is_websocket !is_poa !is_etc !is_eth !is_lukso !is_rsk !is_myorg is_cookie_core
redirect prefix /poa/sokol if !is_websocket !is_poa !is_etc !is_eth !is_lukso !is_rsk !is_myorg is_cookie_sokol
# do this for every line
...

#Check for network name
...
acl is_mynet path_beg -i /myorg/mynet

#Check for cookies
...
acl is_cookie_mynet hdr_sub(cookie) network=mynet

#Default backends
...
use_backend mynet if is_mynet

#WebSocket backends
...
use_backend mynet_ws if is_cookie_mynet is_websocket

backend mynet
    #Proxy mode
    mode http

    #Backend queries should not have network prefix, so we delete it
    acl is_mynet path_beg /myorg/mynet
    reqirep ^([^\ ].*)myorg/mynet[/]?(.*) \1\2 if is_mynet

    #Setting headers to mask our query
    http-request set-header X-Forwarded-Host %[req.hdr(Host)]
    http-request set-header X-Client-IP %[src]
    http-request set-header Host my-blockscout-instance.com

    #Specifying cookie to insert
    cookie network insert

    #Server list. Format:
    #server <name> <address>:<port> cookie <network_name> check inter 60000 fastinter 1000 fall 3 rise 3 ssl verify none
    server mynet_server my-blockscout-instance.com:443 cookie mynet check inter 60000 fastinter 1000 fall 3 rise 3 ssl verify none

backend mynet_ws
    #Check if WebSocket request is correct
    acl hdr_websocket_key      hdr_cnt(Sec-WebSocket-Key)      eq 1
    acl hdr_websocket_version  hdr_cnt(Sec-WebSocket-Version)  eq 1
    http-request deny if ! hdr_websocket_key ! hdr_websocket_version

    #WebSockets should be forwarded, not http proxied
    option forwardfor

    #Setting headers to mask our query
    http-request set-header Host my-blockscout-instance.com
    http-request set-header Origin https://my-blockscout-instance.com

    #Specifying cookie to insert
    cookie network insert

    #Server list. Format:
    #server <name> <address>:<port> cookie <network_name> check inter 60000 fastinter 1000 fall 3 rise 3 check inter 60000 fastinter 1000 fall 3 rise 3 ssl verify none maxconn 30000
    server mynet_server my-blockscout-instance.com:443 cookie mynet check inter 60000 fastinter 1000 fall 3 rise 3 ssl verify none maxconn 30000