UUID format validation for idempotency and tracing
UUID v4 is the usual format for idempotency keys, request IDs, and trace correlation. Typos and version bits wrong (not 4) break lookups and deduplication. Validate format before sending headers to APIs.
Common causes
- Non-hex characters or wrong length.
- Version nibble not 4 for UUID v4.
- Uppercase vs lowercase mismatches in strict stores.
How to fix
- Use UUID Generator to create valid v4 values.
- Validate strings with Idempotency Key Checker when applicable.
- Normalize case if your backend is case-sensitive.
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