@Override
            public void onAppResponse(Object appResponse, String methodName, RequestBase request) {
                Assert.assertNotSame(RpcInvokeContext.getContext(), contexts[0]);
                str[0] = (String) appResponse;
                latch[0].countDown();
            }
@author <a href="mailto:zhanggeng.zg@antfin.com">GengZhang</a>
test/test-integration/src/test/java/com/alipay/sofa/rpc/test/baggage/BaggageCallbackTest.java