CDN Refresh and Preload Diagnostics

Diagnose CDN refresh and preload issues: "content not updated after refresh", "preload failed", "cache not cleared", "URL refresh not effective", "directory refresh still shows old content".

Core approach: First query refresh/preload task records to confirm task status, then follow different diagnostic branches based on refresh type (file / directory / preload).

Observability

All OpenAPI calls (invoked through the aliyun CLI) include:

• User-Agent: --user-agent AlibabaCloud-Agent-Skills/{SKILL_NAME}/{session-id}
• SKILL_NAME: alibabacloud-cdn-refresh-preload
• session-id: 32-character hex string generated per diagnostic session

Prerequisites

1. Python 3.11+ and aliyun CLI — required: aliyun cdn describe-refresh-tasks and aliyun sts assume-role are both invoked via the aliyun CLI (no direct HTTP signing). No external Python SDK dependencies.
2. Alibaba Cloud credentials — Credentials are resolved automatically by the aliyun CLI default credential chain (environment or ~/.aliyun/config.json). Do not read, print, or pass AK/SK/STS tokens explicitly.
3. Target inputs: URL (the resource to diagnose) and UID (the Alibaba Cloud account UID). UID can be omitted — it defaults to the caller account derived via aliyun sts get-caller-identity. Auto-fill first, ask second: never ask the user for UID or role name when they can be derived.