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fix(media-proxy): allow the desktop app origin and preflight (#3325)

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Hampus authored and GitHub committed 2026-10-08 23:21:10 +02:00
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fluxer_docs/src/content/docs/operator/configuration.mdx
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@@ -1441,7 +1441,7 @@ Default `off`. The [cross-origin read policy](/media-proxy/overview/#cross-origi
#### `FLUXER_MEDIA_PROXY_CORS_ALLOWED_ORIGINS`
Default empty. Comma-separated origins that may read media through CORS, such as `https://web.fluxer.app`. Spaces around an entry and empty entries are ignored. Each entry is parsed as a URL and must be `http` or `https` with no credentials, query, fragment, or path beyond `/`. Its host must be an IPv4 address, a bracketed IPv6 address, or a domain name whose labels are ASCII letters, digits, and hyphens after parsing. So a wildcard such as `https://*.fluxer.app`, a brace pattern, an underscore, a trailing dot on a domain name, or any non-ASCII character fails. Write an internationalised domain name in its punycode form. Any failing entry makes the process exit. An entry is compared in the form a browser sends. `https://Web.Fluxer.App:443/` matches `https://web.fluxer.app`. Required when `FLUXER_MEDIA_PROXY_CORS_MODE` is `report` or `enforce`. When the policy is `report` or `enforce`, the Media Proxy logs the parsed list once at startup. When `FLUXER_MEDIA_PROXY_MODE` is `static` or `relay`, the Media Proxy ignores it.
Default empty. Comma-separated origins that may read media through CORS, such as `https://web.fluxer.app`. Spaces around an entry and empty entries are ignored. Each entry is parsed as a URL and must be `http` or `https` with no credentials, query, fragment, or path beyond `/`. Its host must be an IPv4 address, a bracketed IPv6 address, or a domain name whose labels are ASCII letters, digits, and hyphens after parsing. So a wildcard such as `https://*.fluxer.app`, a brace pattern, an underscore, a trailing dot on a domain name, or any non-ASCII character fails. Write an internationalised domain name in its punycode form. The one exception is the desktop app origin `fluxer-app://app`. It is accepted as an entry and is always allowed without one. Any failing entry makes the process exit. An entry is compared in the form a browser sends. `https://Web.Fluxer.App:443/` matches `https://web.fluxer.app`. Required when `FLUXER_MEDIA_PROXY_CORS_MODE` is `report` or `enforce`. When the policy is `report` or `enforce`, the Media Proxy logs the parsed list once at startup. When `FLUXER_MEDIA_PROXY_MODE` is `static` or `relay`, the Media Proxy ignores it.
Compose forwards it from `.env`, and defaults it to the public origin, built from `FLUXER_PUBLIC_ORIGIN`, or from `FLUXER_PUBLIC_SCHEME`, `FLUXER_DOMAIN`, and `FLUXER_PUBLIC_PORT`. That origin is the only entry, so the web app the instance serves reads its own media. The hosted web client and the desktop app run on `https://web.fluxer.app`. To let them read this instance's media through CORS, set the list in `.env` to the public origin and `https://web.fluxer.app`, such as `https://chat.example.com,https://web.fluxer.app`. A value set in `.env` replaces the Compose value, so it must name the public origin too.