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## Problem In the default deployment (`API_PROXY_SCHEME=python`), the nginx config generated from `docker/nginx/ragflow.conf.python` uses: ```nginx proxy_pass http://localhost:9381; # admin proxy_pass http://localhost:9380; # api ``` Inside the RAGFlow container, `/etc/hosts` maps `localhost` to both `127.0.0.1` and `::1`: ``` 127.0.0.1 localhost ::1 localhost ip6-localhost ip6-loopback ``` But the backend services (`ragflow_server.py` on 9380, admin server on 9381) only listen on IPv4 (`127.0.0.1`). When nginx resolves `localhost` to `::1`, the upstream connection fails and nginx falls back to the IPv4 address - each fallback adds ~1 second of latency. Co-authored-by: Jin Hai <haijin.chn@gmail.com>