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How to fix r.map is not a function in the Jellyfin 12 dashboard

The Jellyfin 12 dashboard error r.map is not a function appears when /web/ConfigurationPages returns HTML or an empty body instead of JSON, and the web client keeps that answer in IndexedDB for 24 hours. Fix the reverse proxy, then delete the jellyfin-query-cache key and the browser's cached files.

Tools

How to enable CrowdSec 1.8 bot detection

CrowdSec 1.8 adds bot detection to its WAF, still in alpha, which serves every visitor a page with a proof of work and a browser fingerprint. You enable it with the appsec-bot-challenge collection and its configs in the AppSec acquisition, always behind a compatible bouncer such as OpenResty 1.2.3.