Guard WebSocket upgrades & register at init #84432
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Move WS upgrade listener registration to prepare() (trusted server), drop request-derived server detection, add basic handshake checks, and ensure errors destroy the socket. Reduces unguarded upgrade surface and avoids side-effecty setup from arbitrary requests.
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Move WS upgrade listener registration to prepare() (trusted server), drop request-derived server detection, add basic handshake checks, and ensure errors destroy the socket.
Reduces unguarded upgrade surface and avoids side-effecty setup from arbitrary requests.