Basic OpenBSD Relay

# $OpenBSD: relayd.conf,v 1.4 2018/03/23 09:55:06 claudio Exp $
#
# Macros
#
egress="W.X.Y.Z"
lo="127.0.0.1"

#
# Global Options
#
# interval 10
# timeout 1000
# prefork 5
# log updates

#
# Each table will be mapped to a pf table.
#
table <apache2> { $lo }
table <httpd> { $lo }

http protocol https {
  match request header append "X-Forwarded-For" value "$REMOTE_ADDR"
  match request header append "X-Forwarded-By" \
      value "$SERVER_ADDR:$SERVER_PORT"
  match request header set "Connection" value "close"

  match request header "Host" value "example.com" forward to <httpd>
  match request header "Host" value "test.example.com" forward to <httpd>
  match request header "Host" value "iso.example.com" forward to <apache2>
}

relay wwwtls {
  # Run as a SSL/TLS accelerator
  listen on $egress port 443 tls
  protocol https

  forward to <httpd> port 80 check tcp
  forward to <apache2> port 81 check tcp
}