Ledge
An RFC compliant and ESI capable HTTP cache for Nginx / OpenResty
An RFC-compliant and ESI-capable HTTP cache for Nginx / OpenResty, backed by Redis. Ledge can be utilized as a fast, robust, and scalable alternative to Squid / Varnish, etc, either installed standalone or integrated into an existing Nginx server or load balancer. Moreover, it is particularly suited to applications where the origin is expensive or distant, making it desirable to serve from the cache as optimistically as possible.