server {
  listen 80;
  server_name _;

  location /static/ {
    alias /app/static/;
    add_header Cache-Control "public, max-age=31536000, immutable";
  }

  location /socket.io/ {
    proxy_pass http://app:5000/socket.io/;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header Host $host;
  }

  location / {
    proxy_pass http://app:5000/;
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
  }
}