Nginx configuration for websockets using Thin

nginx.conf

map $http_upgrade $connection_upgrade {
  default upgrade;
  ''      close;
}

upstream thin_websocket {
  server unix:/path/to/thin/socket/file.sock fail_timeout=0;
}

server {
  location /websocket {
    proxy_pass http://thin_websocket;
    
    proxy_redirect off;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    
    proxy_read_timeout 300;
    
    proxy_buffers 32 64k;
    proxy_buffer_size 64k;
  }
}