Return :ok/:error tuples for successful HTTP transations, i.e. when the request is completed (no network errors etc) - but it can still be an application-level error (i.e. 404 or 500).

NOTE: This middleware must be included as the first in the stack (before other middleware)

Example usage

defmodule MyClient do
  use Tesla

  plug Tesla.Middleware.Tuples
  plug Tesla.Middleware.Json
end