http2: http1 fallback missing keepAlive?

Not 100% sure how to http1 compat works but this looks suspicious:

import http2 from 'node:http2'
import https from 'node:https'
import { readFileSync } from 'node:fs'

const server = http2.createSecureServer({
  key: readFileSync('../proxy/cert/server.key'),
  cert: readFileSync('../proxy/cert/server.crt'),
  allowHTTP1: true,
})
.on('request', (req, res) => {
  console.log(req.httpVersion, server.keepAliveTimeout, server.keepAliveTimeoutBuffer) // 1.1 undefined undefined
})
.listen(9999)

https.get('https://localhost:9999', { rejectUnauthorized: false }, (res) => {
  res.end()
})

@ronag

hey @ronag , i reproduced it and found out that there is bug still in the latest build of nodejs as of today too

const http2 = require('node:http2');
const https = require('node:https');
const fs = require('node:fs');
const path = require('node:path');

const key = fs.readFileSync(path.join(__dirname, 'test/fixtures/keys/agent1-key.pem'));
const cert = fs.readFileSync(path.join(__dirname, 'test/fixtures/keys/agent1-cert.pem'));

const server = http2.createSecureServer({
  key,
  cert,
  allowHTTP1: true,
}).on('request', (req, res) => {
  console.log('HTTP Version:', req.httpVersion);
  console.log('KeepAliveTimeout:', server.keepAliveTimeout);
  console.log('KeepAliveTimeoutBuffer:', server.headersTimeout);
  res.end('ok');
  server.close();
}).listen(9999);

https.get('https://localhost:9999', { rejectUnauthorized: false }, (res) => {
  res.resume();
});

amol@Amols-MBP node % ./node ./repro.js 
HTTP Version: 1.1
KeepAliveTimeout: undefined
KeepAliveTimeoutBuffer: 60000

I'd like to work on this! I'm opening a PR to fix it.

http2: add http1Options for HTTP/1 fallback configuration

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http2: http1 fallback missing keepAlive? #59783

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http2: http1 fallback missing keepAlive? #59783

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amyssnippet commented on Feb 7, 2026

amyssnippet commented on Feb 7, 2026

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