{
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));
}
if (config.getPreferredSubprotocols().size() > 0)
{
req.setSubProtocols(config.getPreferredSubprotocols());
}
if (config.getConfigurator() != null)
{
upgradeListener = new JsrUpgradeListener(config.getConfigurator());