HTTP

backport net/http for go1.20+

export net/http from: https://github.com/golang/go/tree/a70addd3b31ccb685f48867e24c6c2b4dc364a11/src/net/http

special modify:

• add TLSConn interface and not depend on *tls.Conn type

  type TLSConn interface {
      net.Conn
      NetConn() net.Conn
      HandshakeContext(ctx context.Context) error
      ConnectionState() tls.ConnectionState
  }