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mode http
timeout connect 5s
timeout client 5s
timeout server 60s
frontend proxy
# listen on 4000
# allow for many connections, with long timeout
maxconn 200000 # total maximum connections, check ulimit as well
timeout client 24h
# default to webapp backend
default_backend webapp
# is this a socket io request?
acl is_websocket path_beg /
acl is_websocket hdr(Upgrade) -i WebSocket AND hdr_beg(Host) -i ws
use_backend websocket if is_websocket
backend webapp
balance roundrobin # assuming that you don't need stickiness
# allow client connections to linger for 5s
# but close server side requests to avoid keeping idle connections
option http-server-close
server ruby1 localhost:3000 check
backend websocket
balance source # balance based on source IP
# options
option forwardfor # add X-Forwarded-For
# Do not use httpclose (= client and server
# connections get closed), since it will close
# Websockets connections
no option httpclose
# Use "option http-server-close" to preserve
# client persistent connections while handling
# every incoming request individually, dispatching
# them one after another to servers, in HTTP close mode
option http-server-close
option forceclose
# timeouts are long
timeout queue 5s
timeout server 24h
timeout connect 24h
# just one node server at :8000
server node1 localhost:8000 check