Objects.requireNonNull(instance,"EndpointInstance cannot be null");
Objects.requireNonNull(path,"Path cannot be null");
ClientEndpointConfig config = (ClientEndpointConfig)instance.getConfig();
ClientUpgradeRequest req = new ClientUpgradeRequest();
UpgradeListener upgradeListener = null;
for (Extension ext : config.getExtensions())
{
req.addExtensions(new JsrExtensionConfig(ext));
}