server {

  listen 443 ssl default_server;
  listen [::]:443 ssl default_server;

  ssl_certificate      /home/ADMIN_USERNAME/certs/cert.pem;
  ssl_certificate_key  /home/ADMIN_USERNAME/certs/key.pem;

  server_name _;

  location / {
    proxy_set_header Host localhost:8545;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header Content-Type application/json;
    add_header Access-Control-Allow-Origin "*";
    add_header Access-Control-Allow-Headers "Origin, X-Requested-With, Content-Type, Accept";

    if ($request_method = 'OPTIONS') {
      add_header Access-Control-Allow-Headers "Origin, X-Requested-With, Content-Type, Accept";
      add_header Access-Control-Allow-Methods "GET, POST, OPTIONS";
      add_header Access-Control-Allow-Origin "*";
      add_header Access-Control-Max-Age 600;
      add_header Content-Type 'text/plain charset=UTF-8';
      add_header Content-Length 0;
      return 204;
    }
    proxy_pass http://localhost:8545;
  }

}