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rust/wasmtime: set TCP_NODELAY on the connected socket #45

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Merged
lann merged 1 commit into from
Aug 11, 2026
Merged

rust/wasmtime: set TCP_NODELAY on the connected socket #45

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15 changes: 15 additions & 0 deletions rust/wasmtime/src/websocket.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -480,6 +480,21 @@ impl Websocket {
}
};

// Latency-sensitive guests (QUIC over the message stream) write
// small messages back-to-back; Nagle would hold the second until
// the peer's delayed ACK. Browsers run WebSocket sockets with
// TCP_NODELAY; match them.
{
let tcp = match ws.get_ref() {
tokio_tungstenite::MaybeTlsStream::Plain(tcp) => Some(tcp),
tokio_tungstenite::MaybeTlsStream::Rustls(tls) => Some(tls.get_ref().0),
_ => None,
};
if let Some(tcp) = tcp {
let _ = tcp.set_nodelay(true);
}
}

let negotiated = response
.headers()
.get("Sec-WebSocket-Protocol")
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