Even if elixir a language, that has adopted his community from a lot of other languages, most of us will probably have a ruby background. But of course, everyone here should be able to read code in a couple of languages, but beeing able to read that language does not mean knowing that languages stdlib or its various libraries available. So whenever you are giving an example in an foreign language you should give a link to the documentation of the functions/methods used.
As far as I can tell from the tests, you can use HTTP Basic Auth, by simply giving [hackney: [basic_auth: {"user", "pass"}]] as an option to any <method>/4 call.
