# `ExOss.CDN.Aliyun`
[🔗](https://github.com/responsus/ex_oss/blob/main/lib/ex_oss/cdn/aliyun.ex#L1)

Alibaba Cloud CDN URL authentication (A, B, C and F).

Configure `aliyun_auth_key` independently of OSS credentials, and set
`aliyun_auth_ttl` to the domain's console TTL (default 1800 seconds).
Upload credentials always use the underlying storage provider.

# `validate!`

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*Consult [api-reference.md](api-reference.md) for complete listing*