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Learn the fundamentals of API status codes and OpenAPI documentation in this comprehensive backend engineering tutorial. Master server response basics including proper body structure formatting and understand the complete range of HTTP status codes used in web development. Explore standard status codes for CRUD operations with detailed examples for GET (both single and multiple records), POST, PUT, PATCH, and DELETE responses. Discover how client flow works in API interactions and understand the role of middleware in request processing. Dive into API documentation best practices using OpenAPI specifications and learn when API documentation becomes essential for your projects. Gain practical knowledge of response formatting, error handling, and documentation standards that are crucial for building robust backend systems and APIs.
