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append RealIP to X-Forwarded-For for WebSocket requests ( 2994)

append RealIP to X-Forwarded-For for WebSocket requests ( 2994): a task in repo2rlenv-commit-runtime-v2 (Harbor dataset). Title: Proxy middleware drops existing X-Forwarded-For entries for WebSocket upgrade requests

The task

**Title:** Proxy middleware drops existing `X-Forwarded-For` entries for WebSocket upgrade requests

Part of FineEnvs/repo2rlenv-commit-runtime.