fix: broken test with node 15

[salmanm]

  const server = http.createServer((req, res) => {
    res.statusCode = 102
    res.end('Hello')
  })
  server.listen(9000)

This simple http server responds differently in Node v14 vs v15.

Response in Node v14

HTTP/1.1 102 Processing
Date: Thu, 21 Jan 2021 15:22:09 GMT
Connection: close

Response in Node v15

HTTP/1.1 102 Processing
Date: Thu, 21 Jan 2021 15:22:09 GMT
Connection: close
Content-Length: 5 // <---

I haven't done a thorough research with node and http specs as to why this behaviour is different but as I understand, the 102 response doesn't return a body. But if you try to send it, Node 14 smartly ignores it and does not send a Content-Length header. However Node 15 sends this header, which is why http-parser-js waits for the body and never fires kOnMessageComplete.

[mcollina]

lgtm