Liberator.Resource.initialize

You're seeing just the callback initialize, go back to Liberator.Resource module for more information.
Link to this callback

initialize(arg1)

View Source (since 1.0)

Specs

initialize(Plug.Conn.t()) :: any()

A hook invoked at the beginning of the decision tree to set up anything you may need.

You can return a map here and it will be merged with the given conn's :assigns map.