Base image moves from AlmaLinux 9 to 10, which forces two related changes: EPEL repo URL bumps to the el10 release RPM, and tini is replaced with dumb-init as PID 1 since tini is not packaged in EPEL 10. Both provide the signal forwarding and zombie reaping the wedged-container fix relies on. Nginx 1.26 in AlmaLinux 10 deprecates the `listen ... http2` parameter, so the server block now uses the separate `http2 on;` directive. Also fixes three issues that affected WebSocket apps (socket.io, ws): - `Connection: upgrade` was hardcoded on every proxied request, including ordinary HTTP. Now driven by a `map $http_upgrade $connection_upgrade` so only genuine upgrade requests carry it. - No explicit proxy read/send timeout meant idle WebSockets were cut at nginx's 60s default. Set to 600s, which clears any sane heartbeat without pinning connection slots (worker_connections is 512, two per client). - `large_client_header_buffers 2 1k` returned 400 for any single header line over 1KB, which session cookies and bearer tokens routinely exceed. Raised to the nginx default of 4 8k; buffers are allocated on demand, so this only costs memory for requests that need it. Verified by rendering the generated config and running it under nginx with a Node backend: WebSocket handshakes return 101 and reach the upstream 'upgrade' event, polling requests arrive with `Connection: close`, and a 3KB cookie returns 200 where the old buffer setting returned 400. README gains a WebSocket Support section covering the PM2 cluster-mode trap, the concurrency ceiling, and reconnects on memory restarts. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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# Claude Code local settings
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.claude/
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