When I typically create a http server in Go, I do:

http.ListenAndServeTLS("https://localhost:8999", "key.pem", "pub.pem", nil)

But under the hood that method does:

ln, err := net.Listen("tcp", addr)

...
...

for {
        rw, err := ln.Accept()
...
...

}

That is not what I want, but instead I wish to:

...

listen, err := net.Listen("tcp", "localhost:8999")
  if err != nil {
    return
  }
  pair, err := tls.LoadX509KeyPair("pub.pem", "key.pem")
  if err != nil {
    return
  }

go func(){
for {
  // Read tcp conn
  l, err := listen.Accept()
  if err != nil {
    return
  }

  // Do something, filter etc

  tlsC := tls.Server(l, &tls.Config{
    ClientAuth:         tls.RequestClientCert,
    Certificates:       []tls.Certificate{pair},
    InsecureSkipVerify: true,
  })
  err := tlsC.Handshake()
  if err != nil {
    return
  }

  // Do something, filter etc

  // I wish to read HTTP request from tlsC here, but without creating yet another goroutine (as http.Serve does)
}}()

...

So I only want http package to read existing connection and parse it, NOT start listening again on net.Listener.