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Change the default Keep-Alive timeout to 95 seconds #371

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Merged
merged 1 commit into from
Aug 5, 2025
Merged

Change the default Keep-Alive timeout to 95 seconds #371

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8 changes: 8 additions & 0 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,14 @@ const server = app.listen(port, () => {
console.log(`Listening on ${port}`)
})

// The number of seconds an idle Keep-Alive connection is kept open. This should be greater than the Heroku Router's
// Keep-Alive idle timeout of 90 seconds:
// - to ensure that the closing of idle connections is always initiated by the router and not the Node.js server
// - to prevent a race condition if the router sends a request to the app just as Node.js is closing the connection
// https://devcenter.heroku.com/articles/http-routing#keepalives
// https://nodejs.org/api/http.html#serverkeepalivetimeout
server.keepAliveTimeout = 95 * 1000

process.on('SIGTERM', async () => {
console.log('SIGTERM signal received: gracefully shutting down')
if (server) {
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