REST API Error Handling Best Practices: HTTP Codes, RFC 9457, and Retryable Errors

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A technical guide published on DEV Community outlines best practices for designing robust error contracts in REST APIs. The guide emphasizes that error responses are a formal part of an API's contract, relied upon by clients, retry mechanisms, and support teams. It covers selecting the correct HTTP status codes per RFC 9110, standardizing error response bodies using RFC 9457 Problem Details format, and distinguishing machine-readable codes from human-readable messages. The guide also addresses common misuses, such as returning 200 with a 'success: false' body or confusing 401 with 403, and highlights the importance of including Retry-After headers with 429 responses. Additionally, it demonstrates how to test error paths using the Apidog API development tool.

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