`//stopwatch on `tracefile off
Please follow the controller actions and render paths for the source code.
example:
``if expr xxx ``else if expr yyy ``else zzz ``
curl -i -H "Accept: application/json" http://127.0.0.1:9000/more.ContentNegotiation/index
Content negotiation works with renderJapid(), which does implicit parameter binding and template picking.
For more doc: see Play Content Negotiation
Reverse lookup is slow...
app mode: "${_play.mode}"