NginxConfig

upstream phoenix_upstream {
  server 127.0.0.1:4000;
}

server {
  listen 80;
  server_name espresso.kickinespresso.com;
  return 301 https://$server_name$request_uri;
}

server { 
  listen [::]:443 ssl ipv6only=on; # managed by Certbot
  listen  443 ssl;
  server_name espresso.kickinespresso.com;
  
  ssl_certificate /etc/letsencrypt/live/espresso.kickinespresso.com/fullchain.pem; # managed by Certbot
  ssl_certificate_key /etc/letsencrypt/live/espresso.kickinespresso.com/privkey.pem; # managed by Certbot
  include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
  ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

  location / {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://phoenix_upstream;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
  }
}

prod.exs

config :espresso, EspressoWeb.Endpoint,
  http: [port: 4000],
  check_origin: false,
  cache_static_manifest: "priv/static/cache_manifest.json",
  server: true,
  code_reloader: false