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  For microservice development, create a microservice project where all project microservices will reside. Create `joyshop_srv`. We need to create user login and registration services, so we will create another directory `user_srv` under the project directory, along with `user_srv/global` (for global object creation and initialization), `user_srv/handler` (for business logic code), `user_srv/model` (for user-related models), `user_srv/pro...`

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  Transitioning: Reasons for a rapid, systematic transition to Go engineering:
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  To advance engineering practices, developing good coding standards and management capabilities.

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