/**
* @param [out] req set of headers to fill in
* @param [in] uri the uri being connected to
* @param [in] subprotocols the list of subprotocols to request
*/
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();
}
