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funkwhale has two S3 surfaces sharing one private bucket. Audio goes out as X-Accel-Redirect and the front nginx fetches it server-side, but attachments (instance logo, avatars, covers) land in the API JSON as absolute URLs the BROWSER dials. AWS_S3_ENDPOINT_URL drives the boto3 client, so with the internal endpoint django-storages signed URLs for http://seaweedfs:8333, a host no browser can reach. Point the client at the new bucket-less public_endpoint key. Measured against the live gateway: a URL signed for seaweedfs:8333 and sent to the public host answers 403 SignatureDoesNotMatch, while one signed for the public host reaches bucket lookup — query-string SigV4 binds the Host, so the signing host and the fetch host must be the same string. AWS_S3_CUSTOM_DOMAIN cannot serve this: storages/backends/s3.py:689 returns UNSIGNED without a CloudFront signer, and the bucket also holds the music library that music/views.py exists to gate. AWS_CA_BUNDLE follows, because the public endpoint is TLS on the local CA and botocore reads its trust store only from that variable (configprovider.py:59) — sys-svc-compose-ca injects SSL_CERT_FILE, REQUESTS_CA_BUNDLE, CURL_CA_BUNDLE and NODE_EXTRA_CA_CERTS, never this one. It takes the bundle rather than the bare root cert, since AWS_CA_BUNDLE replaces the default store. AWS_QUERYSTRING_AUTH=True fixes a pre-existing break: upstream defaults it to `not PROXY_MEDIA`, which produced unsigned URLs against a private bucket. The new front nginx.conf.j2 serves /_protected/media, which the stock template resolves with `alias ${MEDIA_ROOT}/$1;` and therefore 404s for every S3-backed listen. web-svc-seaweedfs keeps no onion vhost. Its tor-contract reason now states the mechanical cause instead of the old claim that the role is never a Tor-browser surface, which decidim and funkwhale have made false: the node hidden service publishes http only while sys-front-tls keys listen/ssl on application_id, so an onion vhost would listen on 443 against a port-80 hidden service. Attachment fetches therefore still fail on an onion pick, and the spec is left to fail there rather than record the miss and pass. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>