--- a/plugins/mod_http.lua	Thu Feb 20 19:08:55 2014 +0100
+++ b/plugins/mod_http.lua	Wed Feb 26 22:19:58 2014 +0100
@@ -51,6 +51,9 @@
 function moduleapi.http_url(module, app_name, default_path)
 	app_name = app_name or (module.name:gsub("^http_", ""));
 	local external_url = url_parse(module:get_option_string("http_external_url")) or {};
+	if external_url.scheme and external_url.port == nil then
+		external_url.port = ports_by_scheme[external_url.scheme];
+	end
 	local services = portmanager.get_active_services();
 	local http_services = services:get("https") or services:get("http") or {};
 	for interface, ports in pairs(http_services) do