Guard 
Guard is connect middleware that short circuits request handling if it can send a 304 Not Modified response. Intended to be used with reverse proxies like Varnish.
Status
Work in-progress. Hold off for a bit.
Stores
Guard can store request and response information wherever you like. In memory is the default. If your site hosts lots of unique URLs, a DB is probably a better choice. Choose one of the following stores, or write your own.
- MemoryStore - the default
- MongoGuardStore - backed by MongoDB
Contributing
$ git clone https://github.com/goodeggs/connect-guard && cd connect-guard
$ npm install
$ npm test