HTTP Status Code Reference
Every status code, what it means in practice, and when you actually return it.
Search by number, name or what you're trying to express. Each code has a "when to return this" note from real APIs, not the RFC paraphrase.
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2xx if the client got what they asked for. 4xx if it's their fault. 5xx if it's yours. The rest are details — but they're the details that decide how clients retry.
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