Update 15.1 (#671)

eBook/15.1.md

@@ -239,7 +239,7 @@ func main() {
 func initServer(hostAndPort string) *net.TCPListener {
 	serverAddr, err := net.ResolveTCPAddr("tcp", hostAndPort)
 	checkError(err, "Resolving address:port failed: '"+hostAndPort+"'")
-	listener, err := net.Listen("tcp", serverAddr.String())
+	listener, err := net.ListenTCP("tcp", serverAddr.String())
 	checkError(err, "ListenTCP: ")
 	println("Listening to: ", listener.Addr().String())
 	return listener

eBook/examples/chapter_15/simple_tcp_server.go

@@ -27,7 +27,7 @@ func main() {
 func initServer(hostAndPort string) *net.TCPListener {
 	serverAddr, err := net.ResolveTCPAddr("tcp", hostAndPort)
 	checkError(err, "Resolving address:port failed: '"+hostAndPort+"'")
-	listener, err := net.Listen("tcp", serverAddr)
+	listener, err := net.ListenTCP("tcp", serverAddr)
 	checkError(err, "ListenTCP: ")
 	println("Listening to: ", listener.Addr().String())
 	return listener