httpAgentOptions
In Node.js versions prior to 18, Next.js automatically polyfills fetch() with node-fetch and enables HTTP Keep-Alive by default.
To disable HTTP Keep-Alive for all fetch() calls on the server-side, open next.config.js and add the httpAgentOptions config:
next.config.js module.exports = {
  httpAgentOptions: {
    keepAlive: false,
  },
}