A simple HTTP daemon

This example shows how to use the TQServerSocket class. It is a very simple implementation of a HTTP daemon that listens on port 8080 and sends back a simple HTML page back for every GET request it gets. After sending the page, it closes the connection.
Implementation (httpd.cpp):
/****************************************************************************
** $Id: qt/httpd.cpp   3.3.8   edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA.  All rights reserved.
**
** This file is part of an example program for TQt.  This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include <stdlib.h>
#include <tqsocket.h>
#include <tqregexp.h>
#include <tqserversocket.h>
#include <ntqapplication.h>
#include <tqmainwindow.h>
#include <tqtextstream.h>
#include <tqvbox.h>
#include <tqlabel.h>
#include <tqtextview.h>
#include <tqpushbutton.h>

// HttpDaemon is the the class that implements the simple HTTP server.
class HttpDaemon : public TQServerSocket
{
    TQ_OBJECT
public:
    HttpDaemon( TQObject* parent=0 ) :
        TQServerSocket(8080,1,parent)
    {
        if ( !ok() ) {
            tqWarning("Failed to bind to port 8080");
            exit( 1 );
        }
    }

    void newConnection( int socket )
    {
        // When a new client connects, the server constructs a TQSocket and all
        // communication with the client is done over this TQSocket. TQSocket
        // works asynchronouslyl, this means that all the communication is done
        // in the two slots readClient() and discardClient().
        TQSocket* s = new TQSocket( this );
        connect( s, TQ_SIGNAL(readyRead()), this, TQ_SLOT(readClient()) );
        connect( s, TQ_SIGNAL(delayedCloseFinished()), this, TQ_SLOT(discardClient()) );
        s->setSocket( socket );
        emit newConnect();
    }

signals:
    void newConnect();
    void endConnect();
    void wroteToClient();

private slots:
    void readClient()
    {
        // This slot is called when the client sent data to the server. The
        // server looks if it was a get request and sends a very simple HTML
        // document back.
        TQSocket* socket = (TQSocket*)sender();
        if ( socket->canReadLine() ) {
            TQStringList tokens = TQStringList::split( TQRegExp("[ \r\n][ \r\n]*"), socket->readLine() );
            if ( tokens[0] == "GET" ) {
                TQTextStream os( socket );
                os.setEncoding( TQTextStream::UnicodeUTF8 );
                os << "HTTP/1.0 200 Ok\r\n"
                    "Content-Type: text/html; charset=\"utf-8\"\r\n"
                    "\r\n"
                    "<h1>Nothing to see here</h1>\n";
                socket->close();
                emit wroteToClient();
            }
        }
    }
    void discardClient()
    {
        TQSocket* socket = (TQSocket*)sender();
        delete socket;
        emit endConnect();
    }
};


// HttpInfo provides a simple graphical user interface to the server and shows
// the actions of the server.
class HttpInfo : public TQVBox
{
    TQ_OBJECT
public:
    HttpInfo()
    {
        HttpDaemon *httpd = new HttpDaemon( this );

        TQString itext = TQString(
                "This is a small httpd example.\n"
                "You can connect with your\n"
                "web browser to port %1"
            ).arg( httpd->port() );
        TQLabel *lb = new TQLabel( itext, this );
        lb->setAlignment( AlignHCenter );
        infoText = new TQTextView( this );
        TQPushButton *quit = new TQPushButton( "quit" , this );

        connect( httpd, TQ_SIGNAL(newConnect()), TQ_SLOT(newConnect()) );
        connect( httpd, TQ_SIGNAL(endConnect()), TQ_SLOT(endConnect()) );
        connect( httpd, TQ_SIGNAL(wroteToClient()), TQ_SLOT(wroteToClient()) );
        connect( quit, TQ_SIGNAL(pressed()), tqApp, TQ_SLOT(quit()) );
    }

    ~HttpInfo()
    {
    }

private slots:
    void newConnect()
    {
        infoText->append( "New connection" );
    }
    void endConnect()
    {
        infoText->append( "Connection closed\n\n" );
    }
    void wroteToClient()
    {
        infoText->append( "Wrote to client" );
    }

private:
    TQTextView *infoText;
};


int main( int argc, char** argv )
{
    TQApplication app( argc, argv );
    HttpInfo info;
    app.setMainWidget( &info );
    info.show();
    return app.exec();
}

#include "httpd.moc"