--- Slim/Networking/Async/HTTP.pm.original	2016-01-01 03:04:24.000000000 +0000
+++ Slim/Networking/Async/HTTP.pm	2017-01-12 15:28:09.000000000 +0000
@@ -177,7 +177,10 @@
 	}
 	
 	my $host = $self->request->uri->host;
-	if ( $self->request->uri->port != 80 ) {
+	# Host needs port number unless we're using default (http - 80, https - 443).
+	# Note that both curl & wget suppress the default port number. Source comment in wget suggests
+	# that broken server-side software often doesn't recognize the port argument.
+	if ( $self->request->uri->port != $self->request->uri->default_port ) {
 		$host .= ':' . $self->request->uri->port;
 	}