Alibabacloud Oss Presigned Url V4 Diagnosis

The skill

Zero-cloud-API diagnosis of OSS presigned (share) URL failures and V1-to-V4 migration: parses a pasted URL, routes to causes (expired, clock skew, V1 signature forbidden, credential rotation, method mismatch, malformed x-oss-credential, SDK config misuse, proxy header tampering). Triggers: "share link expired", "SignatureDoesNotMatch on presigned URL", "V1 signature is forbidden", "x-oss-credential error", "signed URL stops working"; Chinese ticket wording routes via the embedded catalog keyword layer. Do NOT use for transfer error codes, billing, endpoints, traffic abuse / AK-leak, CDN back-to-origin or Referer hotlink configuration requests, or other OSS domains (backup / image processing / direct-access links / static hosting) — route to the matching alibabacloud-oss-* skill. A presigned-URL signature failure stays here even when a CDN or a proxy sits in front of the bucket.

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