in version 2.1 there is a bug need following correction

[pkgvrpdm]

need this patch in file sio_client_impl.cpp in function void client_impl::connect_impl(const string& uri, const string& queryString)
line number 225-226
// If a resource path was included in the URI, use that, otherwise
// use the default /socket.io/.
const std::string path(uo.get_resource() == "/" ? "/socket.io/" : uo.get_resource());

ss<<":"<<uo.get_port()<<path<<"?EIO=3&transport=websocket";

//ss<<":"<<uo.get_port()<<"/socket.io/?EIO=3&transport=websocket";

corrected code is below please someone push this in version 2.1 :

void client_impl::connect_impl(const string& uri, const string& queryString)
{
    do{
        websocketpp::uri uo(uri);
        ostringstream ss;

#if SIO_TLS
ss<<"wss://";
#else
ss<<"ws://";
#endif
const std::string host(uo.get_host());
// As per RFC2732, literal IPv6 address should be enclosed in "[" and "]".
if(host.find(':')!=std::string::npos){
ss<<"["<<uo.get_host()<<"]";
} else {
ss<<uo.get_host();
}
// If a resource path was included in the URI, use that, otherwise
// use the default /socket.io/.
const std::string path(uo.get_resource() == "/" ? "/socket.io/" : uo.get_resource());

        ss<<":"<<uo.get_port()<<path<<"?EIO=3&transport=websocket";
        
        //ss<<":"<<uo.get_port()<<"/socket.io/?EIO=3&transport=websocket";
        if(m_sid.size()>0){
            ss<<"&sid="<<m_sid;
        }
        ss<<"&t="<<time(NULL)<<queryString;
        lib::error_code ec;
        client_type::connection_ptr con = m_client.get_connection(ss.str(), ec);
        if (ec) {
            m_client.get_alog().write(websocketpp::log::alevel::app,
                                      "Get Connection Error: "+ec.message());
            break;
        }

        for( auto&& header: m_http_headers ) {
            con->replace_header(header.first, header.second);
        }

        m_client.connect(con);
        return;
    }
    while(0);
    if(m_fail_listener)
    {
        m_fail_listener();
    }
}