if(IsBlocking())
    while(!IsClosed() && !IsError() && socket->IsOpen())
        Do0();

// while(IsBlocking()  && socket->IsOpen() && !IsError() && out_queue.GetCount())
   while((IsBlocking() || (s[0] == CLOSE))  && socket->IsOpen() && !IsError() && out_queue.GetCount())

void WebSocket::Out(const String& s)
{
	out_queue.AddTail(s);
	while((IsBlocking() || close_sent) && socket->IsOpen() && !IsError() && out_queue.GetCount())
		Output();
}

Vector<String> request_headers;

request_headers = { 
    "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"",
    "Accept-Language: cs,en-US;q=0.7,en;q=0.3",
    ...
};

// The user can add custom headers to the vector with more straight forward wait. Moreover user will not be obligated to remember about /r/n.
auto header = web_socket.StandardHeaders();
header.Add("Custom-header: data");

// Deletation is also trivial of any of the standard headers.
request_headers.Remove(1); // Remove ""Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"",", I don't need it!

// The set method also needs to be change
web_socket.RequestHeaders(request_headers);