do_reverseproxy/sites-available/cloud.nginx

# OwnCloud server configuration
server {
		listen 80;
		server_name cloud.metzner.selfhost.bz;
  	client_max_body_size 4000M;

#		ssl_session_cache  builtin:1000  shared:SSL:10m;

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

		location / {
		  proxy_pass        http://192.168.1.37/owncloud/;
		  proxy_set_header X-Forwarded-Host cloud.metzner.selfhost.bz;
      proxy_set_header X-Forwarded-Proto http;
      proxy_set_header X-Forwarded-For $remote_addr;
		  proxy_buffering off;
		}
	}