This is not applicable to WebSockets.

Yeah, websockets have their own method: http://stackoverflow.com/questions/19298651/how-does-websock.... Cowboy already supports x-webkit-deflate-frame, will support more soon.

It is handled by N2O automatically. See how https://github.com/5HT/n2o/blob/master/priv/bullet.js

Some mentions about the list:

* You can use both Erlang DSL and/or DTL templates

* You can use JSON, BERT, RAW BINARY messages. see http://synrc.com/apps/n2o/doc/web/protocol.htm

* You can use N2O both as server-render and in SPA mode

The Database Support in another our Data Framework for Key-Value storages: https://github.com/synrc/kvs