Facebook Tunneling with nginx example conf

facebook-tunnel-nginx.conf

#
#	included into vhosts/localhost.conf (*.by-ip)
#		answers to :80
#

#	registered with FaceBook
location /forgiveness {
	#	no-trailing-/ case (the rewritten URI has a zero length)
	if ($request_filename = '') {
		rewrite  (.*)  $1/;
	}

	#	the only way i could figure to get conditional proxying
	#		proxy_pass via variables = no
	#		if { proxy_pass } = no
	#		so ... two more goofy contexts

	#	magic tunnel cookie (any value)
	if ($http_cookie ~ '_forgiveness_tunnel=1') {
		#	last : stop rewriting, but re-process through nginx (vs. break)
		rewrite  /forgiveness(.*)  /forgiveness-dev$1  last;
	}
	rewrite  /forgiveness(.*)  /forgiveness-pub$1;
}

location /forgiveness-pub {
	#	root contextify
	#	break to terminate re-processing through nginx
	rewrite /forgiveness-pub(.*)  $1  break;

	proxy_pass  http://cantremember_forgiveness_cluster;
}

location /forgiveness-dev {
	rewrite /forgiveness-dev(.*)  $1  break;

	#	same as public upstream
	proxy_pass  http://127.0.0.1:3100;
}