Retry decision packet

A retry decision packet is the minimum note a developer writes before deciding whether to repeat a failed API request. It separates transport failure, rate limiting, server failure, and side-effect risk.

MDN groups HTTP status codes into informational, success, redirection, client error, and server error classes, and notes that the listed codes are defined by RFC 9110. RFC 9110 defines Retry-After as a header that tells a user agent how long to wait before a follow-up request, including use with 503 and redirection responses. RFC 6585 defines 429 Too Many Requests as a rate-limit response and says it may include Retry-After. Stripe documents idempotency keys for safely retrying create or update requests without accidentally performing the same operation twice.

A useful packet has six fields: endpoint, method, status or network error, Retry-After or reset header, idempotency key or request id, and side-effect classification. GET and safe read requests are usually easier to retry. POST, payment, booking, email, and inventory updates need stronger proof because a retry can duplicate work.

The packet does not replace code. It prevents the maintainer or developer from making a vague decision like “try again” when the real question is whether the previous request may already have changed state.

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