mini-spring-cloud is an educational, simplified reimplementation of core Spring Cloud components, designed to help developers understand the underlying principles of service registration, discovery, client-side load balancing, declarative HTTP clients (Feign), and API gateway (Zuul). The codebase implements a custom lightweight registry called 'Tutu' and integrates with Netflix Ribbon, OpenFeign, and Netflix Zuul libraries. It follows Spring Cloud Commons abstractions and uses Spring Boot auto-configuration. The project is not intended for production use; it serves as a learning resource with minimal error handling, incomplete feature coverage (e.g., only POST mapping support in Feign contract), and no comprehensive test suite. The architecture is modular with separate Maven modules for each concern, and the code is clean and well-commented in Chinese. However, dependencies are somewhat outdated (Spring Cloud 2021.0.1, Ribbon 2.3.0, Zuul 1.3.1) and the project has not seen recent updates.