Update WebSocket examples to set TLS SNI

example/websocket/client/sync-ssl/websocket_client_sync_ssl.cpp

@@ -70,6 +70,14 @@ int main(int argc, char** argv)
         // Make the connection on the IP address we get from a lookup
         auto ep = net::connect(get_lowest_layer(ws), results);
 
+        // Set SNI Hostname (many hosts need this to handshake successfully)
+        if(! SSL_set_tlsext_host_name(ws.next_layer().native_handle(), host.c_str()))
+            throw beast::system_error(
+                beast::error_code(
+                    static_cast<int>(::ERR_get_error()),
+                    net::error::get_ssl_category()),
+                "Failed to set SNI Hostname");
+
         // Update the host_ string. This will provide the value of the
         // Host HTTP header during the WebSocket handshake.
         // See https://tools.ietf.org/html/rfc7230#section-5.4