Choose adapter for your API client.

defmodule ExampleApi do
  use Tesla

  # set adapter as module
  adapter Tesla.Adapter.Hackney

  # set adapter as anonymous function
  adapter fn env ->
    ...
    env
  end
end

Attach middleware to your API client.

defmodule ExampleApi do
  use Tesla

  # plug middleware module with options
  plug Tesla.Middleware.BaseUrl, "http://api.example.com"

  # or without options
  plug Tesla.Middleware.JSON

  # or a custom middleware
  plug MyProject.CustomMiddleware
end