use Haproxy to route different proxy app

haproxy.cfg

# haproxy1.8 version

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 ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
   	ssl-default-bind-ciphersuites TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256

    	ssl-default-bind-options no-sslv3 no-tlsv10 no-tlsv11

   	tune.ssl.default-dh-param 2048
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 ssl
	mode tcp
        bind *:443
        tcp-request inspect-delay 5s
        tcp-request content accept if { req.ssl_hello_type 1 }
	acl web req_ssl_sni -i 0xffff.top
	acl web req_ssl_sni -i www.0xffff.top
	acl trojan req_ssl_sni -i t.0xffff.top
	acl v2ray req_ssl_sni -i v.0xffff.top
	use_backend web_back if web
	use_backend trojan_back if trojan
	use_backend v2ray_back if v2ray

backend v2ray_back
	mode tcp
	server v2ray 127.0.0.1:8899

backend web_back
        mode tcp
        server caddy 127.0.0.1:8888

backend trojan_back
        mode tcp
        server trojan 127.0.0.1:8889