Boost websocket accept hangs

Question

I copied the simple boost websocket example from here and here , and that worked fine. I then added these lines to the server just before the call to create the websocket:

boost::beast::flat_buffer buffer;
boost::beast::http::request<boost::beast::http::string_body> req;
boost::beast::http::read(sock, buffer, req);

Thse lines are taken from this page to read the contents of the message before upgrading to a websocket. Both the server and client now hang on the websocket handshake.

Am I doing something wrong or is this a bug in boost?

Answer 1

If you are going to read the WebSocket upgrade request yourself, then in order to accept the upgrade request you need to use the correct overload of websocket::stream::accept or websocket::stream::async_accept . Use an overload which accepts the HTTP request in the first parameter: https://www.boost.org/doc/libs/1_66_0/libs/beast/doc/html/beast/ref/boost__beast__websocket__stream/accept/overload6.html https://www.boost.org/doc/libs/1_66_0/libs/beast/doc/html/beast/ref/boost__beast__websocket__stream/async_accept/overload3.html