VintageNetWizard.Web.Endpoint.start_server

You're seeing just the function start_server, go back to VintageNetWizard.Web.Endpoint module for more information.
Link to this function

start_server(opts \\ [])

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Specs

start_server([opt()]) ::
  :ok | {:error, :already_started | :no_keyfile | :no_certfile}

Start the web server

If the web server is started then {:error, already_started} is returned.

Only one server can be running at a time.