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);