haproxy.cfg

global
	log /dev/log	local0
	log /dev/log	local1 notice
	chroot /var/lib/haproxy
	stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
	stats timeout 30s
	user haproxy
	group haproxy
	daemon

	# Default SSL material locations
	ca-base /etc/ssl/certs
	crt-base /etc/ssl/private

	# Default ciphers to use on SSL-enabled listening sockets.
	# For more information, see ciphers(1SSL). This list is from:
	#  https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
	# An alternative list with additional directives can be obtained from
	#  https://mozilla.github.io/server-side-tls/ssl-config-generator/?server=haproxy
	ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS
	ssl-default-bind-options no-sslv3

defaults
	log	global
	mode	http
	option	httplog
	option	dontlognull
        timeout connect 5000
        timeout client  50000
        timeout server  50000
	errorfile 400 /etc/haproxy/errors/400.http
	errorfile 403 /etc/haproxy/errors/403.http
	errorfile 408 /etc/haproxy/errors/408.http
	errorfile 500 /etc/haproxy/errors/500.http
	errorfile 502 /etc/haproxy/errors/502.http
	errorfile 503 /etc/haproxy/errors/503.http
	errorfile 504 /etc/haproxy/errors/504.http

frontend http
    bind *:80
    # redirect to https
    # c.f. https://www.haproxy.com/blog/redirect-http-to-https-with-haproxy/
    bind *:443 ssl crt /etc/haproxy/certs/yourdomain.com.pem

    http-request del-header ^X-Forwarded-Proto:
    http-request del-header ^X-Forwarded-For:
    # redirect to https
    http-request set-header X-Forwarded-Proto: https if { ssl_fc }

    acl app1_frontend hdr(Host) -i app1.yourdomain.com
    use_backend app1_backend if app1_frontend

    acl app2_frontend hdr(Host) -i app2.yourdomain.com
    use_backend app2_backend if app2_frontend

    acl app3_frontend hdr(Host) -i app3.yourdomain.com
    use_backend app3_backend if app3_frontend

    acl dialogflow_frontend hdr(Host) -i dialogflow.yourdomain.com
    use_backend dialogflow_https_backend if dialogflow_frontend

backend app1_backend
    mode http
    server app1 app1.yourdomain.com:8000

backend app2_backend
    mode http
    server app2 app2.yourdomain.com:8080

backend app3_backend
    server app3 app3.yourdomain.com:9090

backend dialogflow_https_backend
    server dialogflow.yourdomain.com:8090 check ssl verify none