Properly parse HTTP host for verification

Also fix H2 transport to not verify if host is not defined

transport/internet/splithttp/hub.go

@@ -72,7 +72,7 @@ func (h *requestHandler) upsertSession(sessionId string) *httpSession {
 }
 
 func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
-	if len(h.host) > 0 && !strings.Contains(strings.ToLower(request.Host), strings.ToLower(h.host)) {
+	if len(h.host) > 0 && !internet.IsValidHTTPHost(request.Host, h.host) {
 		errors.LogInfo(context.Background(), "failed to validate host, request:", request.Host, ", config:", h.host)
 		writer.WriteHeader(http.StatusNotFound)
 		return