After receiving the HTTP request, the user service calls the grpc server provided by the message service through the grpc client
The example shows how to use tracing middleware
You can experience the effect by following the command
run example
# Windows start-windows.bat
# mac/linux
sh start.sh
curl http://localhost:8000/v1/user/get/message/10
# Open with browser http://localhost:16686
# You can see the effect