mutithread in http-server

I wanna develop a http server using muti-thread,during the communication connections,which some must keep-alive.
how the plan it.
or someone give me the source code with explainatons..

in addition,
see the defination if class timeserver

Code:

void timeserver:::incomingConnection(socketdescriptor,0);
{
 
          TimeThread *thread = new TimeThread(socketDescriptor,0);
           connect(thread,SIGNAL(finished()),dlg,SLOT(showResult()),Qt::QueuedConnection);
            connect(thread,SIGNAL(finished()),thread,SLOT(deletelater()),Qt::DirectConnection);
 
            thread->start();
 
}

Code:

defination of class TimeThread
void TimeThread::run()
{
       QTcpSocket socket = new QTcpSocket;
       if(!socket->setSocketDescriptor(socketDescriptor))
        {
                   return;
 
 
        }
 
          socket->write("aaa");
        connect(socket,SIGNAL(readyRead()),this,SLOT(read()));// never exec the read() function when the client has sent the data, why?
 
 
 
 
 
}
 
void TimeThread::read()
{
         qDebug() << "reading data";
 
}

as u see,I can only send data to client, how can i receive data from client,where should the slot function set?//

Code:

connect(socket,SIGNAL(readyRead()),this,SLOT(read()));