do_reverseproxy/sites-available/gogs.nginx

# Git server configuration
server {
		listen 80;
		server_name gogs.metzner.myhome-server.de;

		client_max_body_size 50m;

		access_log            /var/log/nginx/git.metzner.access.log;
		error_log            /var/log/nginx/git.metzner.error.log;

		location / {

			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_set_header        X-Forwarded-Proto $scheme;
	  	proxy_pass          http://localhost:3000;
			proxy_read_timeout  90;
		}
}