View Source Flowy.Web.Controllers.FallbackController (Flowy v0.1.0)
A fallback plug is useful to translate common domain data structures
into a valid %Plug.Conn{}
response. If the controller action fails to
return a %Plug.Conn{}
, the provided plug will be called and receive
the controller's %Plug.Conn{}
as it was before the action was invoked
along with the value returned from the controller action.