API Semantics

Behaving correctly when the caller retries, floods you, or hits an error path.

3 concepts · 100 minutes

• IdempotencyMaking 'do it again' safe — the single idea that separates reliable distributed code from hope.
• Rate LimitingToken buckets and 429s — protecting a service from its own users and from you.
• Error HandlingExpected vs unexpected failures, and returning something the caller can actually act on.