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Add hint about CSP when changing asset URLs #1586

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Add hint about CSP when changing asset URLs #1586

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4 changes: 4 additions & 0 deletions content/en/admin/optional/object-storage.md
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Expand Up @@ -107,6 +107,10 @@ CDN.
You must serve the files with CORS headers, otherwise some functions of Mastodon's web UI will not work. For example, `Access-Control-Allow-Origin: *`
{{</ hint >}}

{{< hint style="info" >}}
If you change the domain name where you host your files (e.g. from local to object-storage, or between object-storage hosts), you must ensure that the new domain name is added to the `Content-Security-Policy` header of your instance at least one week before the change, because the service workers for Mastodon will cache the value for up to a week. Otherwise your users will see broken images.
{{</ hint >}}

### Optional environment variables

#### `S3_OPEN_TIMEOUT`
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