Standalone and keepAliveTimeout

[ReinoutStevens]

Describe the feature you'd like to request

It seems you cannot configure the keepAliveTimeout when doing a Standalone build, as the only way to configure this is through a CLI arg with next start.

Describe the solution you'd like

Be able to configure the keepAliveTimeout through some other manner, for example an ENV variable, or as part of NextJS's config.

Describe alternatives you've considered

The only alternative is either not using the standalone feature, or modifying the standalone server by hand and adding the keepAliveTimeout by hand.

[SukkaW]

@ReinoutStevens

The keepAliveTimeout has been requested before, see #28642. And one of the Next.js team members has already answered about this (and here I quote):

• it can't be in next.config.js given that it has to be set before next.config.js is loaded.
• These changes would only cover next start so it would not make sense to have an env var which could be assumed as that it'll apply to every environment.

Configuring through cli parameters is already implemented in #35827 and you can try it right now with --keepAliveTimeout: https://nextjs.org/docs/api-reference/cli#keep-alive-timeout

[ReinoutStevens]

The standalone server does not take any CLI arguments, and runs by just executing node server.js

[SukkaW]

The standalone server does not take any CLI arguments, and runs by just executing node server.js

Although you can use node server.js directly, IMHO it is recommended that you implement your own server.js if you want to have some customizations.

As you can see, not only does the standalone server.js "missing" keep-alive-timeout, but also binds the domain localhost by default and does not allow change.

[AdamKatzDev]

@SukkaW could you please explain why writing a custom server.js should be a thing? I couldn't find any mention of this in the NextJS documentation.

[AdamKatzDev]

I've also stumbled upon this limitation in the server.js. It just feels like the standalone feature is not complete without the same configuration capabilities as next start.

[billnbell]

What is the status ? Anyone have a good server.js for --keepAliveTimeout 70000 ?

[billnbell]

OK here is a patch file

diff --git a/node_modules/next/dist/build/utils.js b/node_modules/next/dist/build/utils.js
index 5ef37b9..81b8f62 100644
--- a/node_modules/next/dist/build/utils.js
+++ b/node_modules/next/dist/build/utils.js
@@ -1216,6 +1216,8 @@ const server = http.createServer(async (req, res) => {
     res.end('internal server error')
   }
 })
+server.keepAliveTimeout = 61000;
+server.headersTimeout = 62000;
 const currentPort = parseInt(process.env.PORT, 10) || 3000
 const hostname = process.env.HOSTNAME || 'localhost'

[masterkain]

in standalone server build if you open up server.js you will find this

const keepAliveTimeout = parseInt(process.env.KEEP_ALIVE_TIMEOUT, 10);

[billnbell]

I opened it up and see the following and nothing about process.env.KEEP_ALIVE_TIMEOUT

const NextServer = require('next/dist/server/next-server').default
const http = require('http')
const path = require('path')
process.env.NODE_ENV = 'production'
process.chdir(__dirname)

// Make sure commands gracefully respect termination signals (e.g. from Docker)
// Allow the graceful termination to be manually configurable
if (!process.env.NEXT_MANUAL_SIG_HANDLE) {
  process.on('SIGTERM', () => process.exit(0))
  process.on('SIGINT', () => process.exit(0))
}

let handler

const server = http.createServer(async (req, res) => {
  try {
    await handler(req, res)
  } catch (err) {
    console.error(err);
    res.statusCode = 500
    res.end('internal server error')
  }
})
const currentPort = parseInt(process.env.PORT, 10) || 3000
const hostname = process.env.HOSTNAME || 'localhost'

server.listen(currentPort, (err) => {
  if (err) {
    console.error("Failed to start server", err)
    process.exit(1)
  }
  const nextServer = new NextServer({
    hostname,
    port: currentPort,
    dir: path.join(__dirname),
    dev: false,
    customServer: false,
    conf: {"env":{},"webpack":null,"webpackDevMiddleware":null,"eslint":{"ignoreDuringBuilds":false,"dirs":["."]},"typescript":{"ignoreBuildErrors":false,"tsconfigPath":"tsconfig.json"},"distDir":"./.next","cleanDistDir":true,"assetPrefix":"","configOrigin":"next.config.js","useFileSystemPublicRoutes":true,"generateEtags":true,"pageExtensions":["tsx","ts","jsx","js"],"target":"server","poweredByHeader":true,"compress":true,"analyticsId":"","images":{"deviceSizes":[640,750,828,1080,1200,1920,2048,3840],"imageSizes":[16,32,48,64,96,128,256,384],"path":"/_next/image","loader":"default","loaderFile":"","domains":["source.unsplash.com","fakeimg.pl","cloud.exclusiveresorts.com","res.cloudinary.com"],"disableStaticImages":false,"minimumCacheTTL":60,"formats":["image/webp"],"dangerouslyAllowSVG":false,"contentSecurityPolicy":"script-src 'none'; frame-src 'none'; sandbox;","contentDispositionType":"inline","remotePatterns":[],"unoptimized":false},"devIndicators":{"buildActivity":true,"buildActivityPosition":"bottom-right"},"onDemandEntries":{"maxInactiveAge":15000,"pagesBufferLength":2},"amp":{"canonicalBase":""},"basePath":"","sassOptions":{},"trailingSlash":false,"i18n":{"defaultLocale":"en","locales":["en"]},"productionBrowserSourceMaps":false,"optimizeFonts":true,"excludeDefaultMomentLocales":true,"serverRuntimeConfig":{},"publicRuntimeConfig":{},"reactStrictMode":true,"httpAgentOptions":{"keepAlive":true},"outputFileTracing":true,"staticPageGenerationTimeout":60,"swcMinify":true,"output":"standalone","experimental":{"clientRouterFilter":false,"preCompiledNextServer":false,"fetchCacheKeyPrefix":"","middlewarePrefetch":"flexible","optimisticClientCache":true,"manualClientBasePath":false,"legacyBrowsers":false,"newNextLinkBehavior":true,"cpus":9,"sharedPool":true,"isrFlushToDisk":true,"workerThreads":false,"pageEnv":false,"optimizeCss":false,"nextScriptWorkers":false,"scrollRestoration":false,"externalDir":false,"disableOptimizedLoading":false,"gzipSize":true,"swcFileReading":true,"craCompat":false,"esmExternals":true,"appDir":false,"isrMemoryCacheSize":52428800,"fullySpecified":false,"outputFileTracingRoot":"/Users/bill/thesourcev2","swcTraceProfiling":false,"forceSwcTransforms":false,"largePageDataBytes":128000,"enableUndici":false,"adjustFontFallbacks":false,"adjustFontFallbacksWithSizeAdjust":false,"typedRoutes":false,"instrumentationHook":false,"trustHostHeader":false},"configFileName":"next.config.js"},
  })
  handler = nextServer.getRequestHandler()

  console.log(
    'Listening on port',
    currentPort,
    'url: http://' + hostname + ':' + currentPort
  )
})%  

[masterkain]

ensure you have the proper version, it has been introduced here 9dbd8d7