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Simple Nginx proxy reverse configuration add the file proxy.conf in /etc/nginx/conf.d/ proxy_http_version 1.1; proxy_set_header Host               $http_host; proxy_set_header X-Real-IP          $remote_addr; proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto  $scheme; proxy_set_header Upgrade            $http_upgrade; proxy_set_header Connection         "Upgrade";  Configuration for the domain simple server { listen 80; listen [::]:80; server_name example.com; location / {   include conf.d/proxy.conf; proxy_pass http://192.168.123.321:3000/; } }

A problem in WordPress SSL HAPROXY Have a problem to put your SSL in your WordPress using HAPROXY as a reverse proxy? To resolve this is simple Add in  wp-config.php define('FORCE_SSL_ADMIN', true); define('FORCE_SSL_LOGIN', true); if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') $_SERVER['HTTPS']='on'; Add this in your haproxy. frontend webfront mode http bind 0.0.0.0:443 ssl crt /etc/haproxy/certs.d reqadd X-Forwarded-Proto:\ https ... ... Make sure to use option http-server-close  as well or the reqadd setting might not work as expected.