if (!"WebSocket".equalsIgnoreCase(headers.getUpgrade())) { handleInvalidUpgradeHeader(request, response); return false;
if (!"WebSocket".equalsIgnoreCase(headers.getUpgrade())) { handleInvalidUpgradeHeader(request, response); return false;
if (!"WebSocket".equalsIgnoreCase(headers.getUpgrade())) { handleInvalidUpgradeHeader(request, response); return false;