mastodon.zunda.ninja is one of the many independent Mastodon servers you can use to participate in the fediverse.
Zundon is a single user instance as home of @zundan as well as a test bed for changes of the code.

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Server stats:

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active users

ぐえー

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https ://s3.amazonaws.com/zundan-mastodon/cache/media_attachments/files/…mp3. (Reason: CORS request did not succeed). Status code: (null)

確かにS3にcurlしてもCORSヘッダは返ってこない

AllowedHeadersに*を追加して解決しました。curlで送ったリクエストは単純なGETでプレフライトにしてないからCORSヘッダが返ってこないだけみたい。