permessageDeflate.getParameters().add(
new WsExtensionParameter("client_max_window_bits", null));
List<Extension> extensions = new ArrayList<>(1);
extensions.add(permessageDeflate);
Endpoint ep = new PojoEndpointClient(testCaseClient, null);
ClientEndpointConfig.Builder builder = ClientEndpointConfig.Builder.create();
ClientEndpointConfig config = builder.extensions(extensions).build();
wsc.connectToServer(ep, config, uri);
testCaseClient.waitForClose();