 
   defp cache_static_manifest(endpoint) do
     if inner = endpoint.config(:cache_static_manifest) do
-      {app, inner} = 
+      {app, inner} =
         case inner do
           {_, _} = inner -> inner
           inner when is_binary(inner) -> {endpoint.config(:otp_app), inner}

    host   = host_to_binary(url[:host] || "localhost")
    port   = port_to_integer(url[:port] || port)

    if host =~ ":" do
      Logger.warn("url: [host: ...] configuration value #{inspect(host)} for #{inspect(endpoint)} is invalid")
    end



  @doc """
  List of keys which we ensure are unchanged from compile time to runtime. For
  example, the :force_ssl option must be available at compile time in order to
  work properly. We check these keys so we can warn the user that changing the
  option at runtime may lead to undesirable behavior.
  """
