nginx / cache_purge (project fully funded by yo.se)
Patch adding ability to purge content from nginx's FastCGI and proxy caches.

WARNING! This patch is no longer maintained, please use ngx_cache_purge module instead!

Download:
patch against nginx-0.8.8
(SHA1: b607e8d6619d749f1e2fe4ee8c669571434e3854)
patch against nginx-0.8.26
(SHA1: 3180d7fcbcdfbdcdd586e0f445f33ca75eabdacf)

Example configuration:
proxy_cache_path   /tmp/cache   keys_zone=tmpcache:10m;

location / {
	proxy_pass		http://127.0.0.1:8000;
	proxy_cache		tmpcache;
	proxy_cache_key		$uri$is_args$args;
}

location ~ /purge(/.*) {
	allow			127.0.0.1;
	deny			all;
	proxy_cache_purge	tmpcache   $1$is_args$args;
}