alibabacloud-oss-presigned-url-v4-diagnosis

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 …

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