You're seeing just the function connect, go back to Ankh.HTTP module for more information.
Link to this function

connect(uri, options \\ [])


connect(URI.t(), Ankh.Transport.options()) ::
  {:ok, Ankh.Protocol.t()} | {:error, any()}

Establishes an HTTP connection to a server

After establishing the connection, request can be user to send request to the server and stream can be used to receive receive responses.