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HTTP Status Codes Error 409: Conflict

Warning✕ Not retryable · fix the payloadHTTP 409 ConflictAPI Gateway

TL;DR · 10-second read

The request conflicts with current state: duplicate unique value or a stale version (optimistic locking). Re-fetch the resource and resolve the conflict before retrying.

Identify: does your log match?

What you see · exact log / response

HTTP/1.1 409 Conflict
Content-Type: application/json

{"error":"conflict","message":"A user with email ada@example.com already exists"}

Fix

Being written

Copy-paste fixes for 409 are in the enrichment queue

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Related errors

Last verified 2026-10-09 · Source: IANA HTTP Status Code Registry (RFC 9110) · Official docs ↗ · ~12,100 searches/mo