http: disconnect in 1 minute after upgraded 12.19

[nwtgck]

• v12.19.0
• Darwin 18.7.0 Darwin Kernel Version 18.7.0: Thu Jun 18 20:50:10 PDT 2020; root:xnu-4903.278.43~1/RELEASE_X86_64 x86_64
• http

What steps will reproduce the bug?

Run server using the following code with Node 12.19. It works on v12.18.4.

const http = require('http');

const server = http.createServer((req, res) => {
  req.pipe(process.stdout);
});
console.log('Running...');
server.listen(3000);

A client streams as follows.

seq inf | pv --rate-limit 10 | curl -sST- localhost:3000

In just one minute, the server disconnects the connection.

Demo video

See the demo video below.
https://youtu.be/8I-gNn6GS2g?t=60

How often does it reproduce? Is there a required condition?

Always.

What is the expected behavior?

Not disconnect.

[Flarna]

I think this is a duplicate of #35661

Shoud be fixed in 12.20.0 currently in preparation.

I will close this. Please reopen in case my assessment is wrong.