# Alibabacloud Oss Presigned Url V4 Diagnosis

> Zero-cloud-API diagnosis of OSS presigned (share) URL failures and V1-to-V4 migration: parses a p…

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.

- Page: https://ss33.ai/skills/aliyun/alibabacloud-oss-presigned-url-v4-diagnosis-31418129558
- Publisher: aliyun
- Category: [Software Development](https://ss33.ai/skills/category/software-development-t44z8z) › [DevOps & cloud](https://ss33.ai/skills/category/software-development-t44z8z/devops-and-cloud-unkt50)
- Source: https://github.com/aliyun/alibabacloud-aiops-skills/blob/32598d65d9643343f0580393355f1e4803fc5007/skills/others/cseskillshub/alibabacloud-oss-presigned-url-v4-diagnosis/SKILL.md

## Skill

This skill's licence does not allow redistribution, so the store does not serve its text. Get it from the author: https://github.com/aliyun/alibabacloud-aiops-skills/blob/32598d65d9643343f0580393355f1e4803fc5007/skills/others/cseskillshub/alibabacloud-oss-presigned-url-v4-diagnosis/SKILL.md