From 0abd98889f5f0d3ad04655f4f141dddc4c22edee Mon Sep 17 00:00:00 2001
From: Robert Nagy <ronagy@icloud.com>
Date: Sat, 6 Sep 2025 14:54:00 +0200
Subject: [PATCH] http: unbreak keepAliveTimeoutBuffer

Adds a guard.
---
 lib/_http_server.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/_http_server.js b/lib/_http_server.js
index c5681725ca5401..322793f012a64d 100644
--- a/lib/_http_server.js
+++ b/lib/_http_server.js
@@ -1027,11 +1027,16 @@ function resOnFinish(req, res, socket, state, server) {
       socket.end();
     }
   } else if (state.outgoing.length === 0) {
-    if (server.keepAliveTimeout && typeof socket.setTimeout === 'function') {
+    const keepAliveTimeout = NumberIsFinite(server.keepAliveTimeout) && server.keepAliveTimeout >= 0 ?
+      server.keepAliveTimeout : 0;
+    const keepAliveTimeoutBuffer = NumberIsFinite(server.keepAliveTimeoutBuffer) && server.keepAliveTimeoutBuffer >= 0 ?
+      server.keepAliveTimeoutBuffer : 1e3;
+
+    if (keepAliveTimeout && typeof socket.setTimeout === 'function') {
       // Extend the internal timeout by the configured buffer to reduce
       // the likelihood of ECONNRESET errors.
       // This allows fine-tuning beyond the advertised keepAliveTimeout.
-      socket.setTimeout(server.keepAliveTimeout + server.keepAliveTimeoutBuffer);
+      socket.setTimeout(keepAliveTimeout + keepAliveTimeoutBuffer);
       state.keepAliveTimeoutSet = true;
     }
   } else {