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Zen is a lightweight HTTP framework built on Go's standard library, offering a clean developer experience, precise control over middleware, and seamless OpenAPI integration. It was created to overcome limitations found in existing frameworks, particularly around error handling, logging, and response capture. Zen follows a schema-first approach for OpenAPI, minimizes dependencies, and ensures handlers focus on business logic. It provides granular control over middleware execution, improving metrics, logging, and error responses while maintaining type safety without boilerplate.