nginx.conf.erb

daemon off;
#Heroku dynos have at least 4 cores.
worker_processes <%= ENV['NGINX_WORKERS'] || 4 %>;

events {
	use epoll;
	accept_mutex on;
	worker_connections 1024;
}

http {
	lua_package_path "<%= "#{ENV["HOME"]}/nginx/bin/openresty/lualib/?.lua;;" %>";

  brotli on;
  brotli_static on;
  brotli_comp_level 6;
  brotli_min_length 512;
  brotli_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

  gzip on;
  gzip_static on;
  gzip_comp_level 4;
  gzip_min_length 512;
  gzip_proxied any;
  gzip_vary on;
  gzip_disable "MSIE [1-6]\.(?!.*SV1)";
  gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

  server_tokens off;

  tcp_nodelay on;
  tcp_nopush on;

  log_format l2met "measure#nginx.service=$request_time request_id=$http_x_request_id";
  access_log logs/nginx/access.log l2met;
  error_log logs/nginx/error.log;

  include mime.types;
  default_type application/octet-stream;
  sendfile on;

	upstream app_server {
		server unix:/tmp/nginx.socket fail_timeout=0;
 	}

	server {
		listen <%= ENV["PORT"] %>;
		server_name _;
		keepalive_timeout 5;

		location / {
			proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
			proxy_set_header Host $http_host;
			proxy_redirect off;
			proxy_pass http://app_server;
		}
	}
}