lib::error_code client_handshake_request(request_type& req, uri_ptr uri,
std::vector<std::string> const & subprotocols) const
{
req.set_method("GET");
req.set_uri(uri->get_resource());
req.set_version("HTTP/1.1");
req.append_header("Upgrade", "websocket");
req.append_header("Connection", "Upgrade");
req.replace_header("Sec-WebSocket-Version", "13");
req.replace_header("Host", uri->get_host_port());
if (!subprotocols.empty())
{
std::ostringstream result;
std::vector<std::string>::const_iterator it = subprotocols.begin();
result << *it++;
while (it != subprotocols.end())
{
result << ", " << *it++;
}
req.replace_header("Sec-WebSocket-Protocol", result.str());
}
// Generate handshake key
frame::uint32_converter conv;
unsigned char raw_key[16];
for (int i = 0; i < 4; i++)
{
conv.i = m_rng();
std::copy(conv.c, conv.c + 4, &raw_key[i * 4]);
}
req.replace_header("Sec-WebSocket-Key", base64_encode(raw_key, 16));
return lib::error_code();
}
