beast: async_read: Transport endpoint is not connected

Hi,

When running the websocket_echo example, I get the following output when connecting to it with a simple program that connects to the server, sends a message and receive the message and then closes the link:

[#1 127.0.0.1:59662] async_read: Transport endpoint is not connected

Sample:

beast::websocket::stream<boost::asio::ip::tcp::socket&> ws {sock};
ws.handshake("127.0.0.1", "/");
ws.write(boost::asio::buffer(std::string("Hello, World!")));

// Receive the message
beast::streambuf sb;
beast::websocket::opcode op;
ws.read(op, sb);

std::this_thread::sleep_for(std::chrono::milliseconds(500));
std::cout << "Resp: " << beast::to_string(sb.data()) << std::endl;

ws.close(beast::websocket::close_code::normal);

When closing the link I expected no output because of the following lines (examples/websocket_async_echo_server.hpp:318):

if(ec == beast::websocket::error::closed)
  return;

I’m not sure if this is a bug or a misunderstanding on my side. Let me know.

Regards, Matthijs