consider adding ETag headers to server responses

[carocad]

See comments below

[carocad]

https://devcenter.heroku.com/articles/increasing-application-performance-with-http-cache-headers

[carocad]

food for thought:
maybe we can use the URL together with the entity transaction time to generate an ETAG to avoid further requests

[carocad]

note: the json middleware could be use together with the etag middleware to provide the caching mechanism

• http://ring-clojure.github.io/ring/ring.middleware.not-modified.html
• https://github.com/mikejs/ring-etag-middleware/blob/master/src/ring/middleware/etag.clj

related middleware

• http://ring-clojure.github.io/ring/ring.middleware.not-modified.html