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

accept(uri, socket, options \\ [])


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

Accepts an HTTP connection

After accepting the connection, stream will receive requests from the client and respond can be used to send replies.