/api/health needs X-Secret-Key but stays outside the rate limit. Only the admin key gets load_errors from /api/services, default error details no longer name the exception class, and a prepare signal replaces aiohttp's Server banner on every response while the CDM routes keep their own.
POST/DELETE /api/dashboard/drain refuses new sessions and jobs (SERVER_DRAINING, 409) and warns open sessions. A CDN can replace a 5xx body, so server errors are now 422, retryable ones and the tunnel check 424, and a new middleware turns any 5xx into 422.
BREAKING CHANGE: INTERNAL_ERROR, DOWNLOAD_ERROR, WORKER_ERROR and the fallback return 422 instead of 500; NETWORK_ERROR and SERVICE_UNAVAILABLE return 424 instead of 503; /api/tunnel/check failures return 424 instead of 502.
Every structured error carries a short ref, appended to its message and logged with the request; /api/dashboard/status gains per-service error counts. Gzip now compresses in place.
Cloudflare replaces an origin 502 body with its own page, so clients got "502: Bad gateway" in place of the error and resent each failed licence.
BREAKING CHANGE: SERVICE_ERROR and DRM_ERROR now return HTTP 422 instead of 502.
A session above the cap licenses with the client's own device, and a track above it in an uncapped -q run is handed back to the client. Also names the fallback in the ccextractor crash warning.
Regions in GEOBLOCK refuse the service and everything else is allowed. A hit stops the run with a region error instead of auto-proxying; the check also covers proxy exits and the remote-dl client region.
Bind sessions and download jobs to the API key (not source IP), reject path-traversal cache keys, bound decompression of peer-supplied blobs, gate the CDM device before the vault fallback, and compare API keys in constant time.
Missing requested subtitle and audio languages now warn and continue when --best-available is set instead of hard-exiting. Without the flag, missing languages still produce an error and exit, matching the prior strict behavior. Audio missing-lang detection is now symmetric with subtitles.
- add find_missing_langs helper in core/utilities for reuse between s_lang and a_lang paths (skips all/best/orig sentinels)
- refactor dl.py s_lang/a_lang checks to share the helper
- add tests/lang_selection covering match primitives, helper output, and tricky langcodes corners (zh-Hans/zh-Hant/zh-CN/zh-TW/zh-HK, cmn/yue, fil/tl/tgl)
- clean up unused-var ruff F841 in tests/remote/unit/
Covers RemoteClient/RemoteService, REST routes, handlers, SessionStore, InputBridge, DownloadQueueManager, errors, compression, and serve CLI. E2e tier opts in via --live and can auto-spawn its own serve.
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