Secologist V2Ray HAProxy & Nginx Configuration Examples: https://www.secologist.com/anonymous-v2ray-vpn

haproxy.cfg

global
    log stdout format raw local0
    maxconn 10000
    tune.bufsize 32768
    tune.maxrewrite 1024
    tune.ssl.default-dh-param 2048

defaults
    log     global
    mode    http
    option  httplog
    option  dontlognull
    timeout connect 5000ms
    timeout client  50000ms
    timeout server  50000ms
    timeout http-keep-alive 30000ms
    timeout client-fin 30000ms
    timeout server-fin 30000ms

frontend http_front
    bind *:8080
    mode http
    timeout client 50s
    http-request set-var(txn.host) urlp(host)
    acl host_valid var(txn.host) -m found
    use_backend dynamic_back if host_valid
    default_backend default_back

backend dynamic_back
    mode http
    timeout connect 10s
    timeout server 50s
    http-request set-header Host %[var(txn.host)]
    server dynamic 104.26.1.78:80

backend default_back
    mode http
    timeout connect 10s
    timeout server 50s
    http-request set-header Host falkenstein-lb-1.vs.secologist.com
    server default falkenstein-lb-1.vs.secologist.com:80

nginx.conf

worker_processes auto;
daemon off;

events {
    worker_connections 4096;
    multi_accept on;
    use epoll;
}

http {
    resolver 127.0.0.11 valid=30s;
    server {
        listen 8080;

        location / {
            proxy_pass http://$arg_host:80;
            proxy_set_header Host $arg_host;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_http_version 1.1;

            # WebSocket support
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        # Default backend if host is not specified in the URI
        location = /vip {
            proxy_pass http://falkenstein-lb-1.vs.secologist.com:80;
            proxy_set_header Host falkenstein-lb-1.vs.secologist.com;
            proxy_http_version 1.1;

            # WebSocket support
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }
    }

    access_log off;
    error_log /dev/stdout crit;
}