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<title>A simple HTTP daemon</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>A simple HTTP daemon</h1>

 
<p> 
<p> This example shows how to use the <a href="qserversocket.html">QServerSocket</a> 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.
<p> <hr>
<p> Implementation (httpd.cpp):
<p> <pre>/****************************************************************************
** $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 Qt.  This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include &lt;stdlib.h&gt;
#include &lt;<a href="qsocket-h.html">qsocket.h</a>&gt;
#include &lt;<a href="qregexp-h.html">qregexp.h</a>&gt;
#include &lt;<a href="qserversocket-h.html">qserversocket.h</a>&gt;
#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a href="qmainwindow-h.html">qmainwindow.h</a>&gt;
#include &lt;<a href="qtextstream-h.html">qtextstream.h</a>&gt;
#include &lt;<a href="qvbox-h.html">qvbox.h</a>&gt;
#include &lt;<a href="qlabel-h.html">qlabel.h</a>&gt;
#include &lt;<a href="qtextview-h.html">qtextview.h</a>&gt;
#include &lt;<a href="qpushbutton-h.html">qpushbutton.h</a>&gt;

// HttpDaemon is the the class that implements the simple HTTP server.
class HttpDaemon : public <a href="qserversocket.html">QServerSocket</a>
{
    <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
    HttpDaemon( <a href="qobject.html">QObject</a>* parent=0 ) :
        <a href="qserversocket.html">QServerSocket</a>(8080,1,parent)
    {
        if ( !ok() ) {
            <a href="qapplication.html#qWarning">qWarning</a>("Failed to bind to port 8080");
            exit( 1 );
        }
    }

    void newConnection( int socket )
    {
        // When a new client connects, the server constructs a QSocket and all
        // communication with the client is done over this QSocket. QSocket
        // works asynchronouslyl, this means that all the communication is done
        // in the two slots readClient() and discardClient().
        <a href="qsocket.html">QSocket</a>* s = new <a href="qsocket.html">QSocket</a>( this );
<a name="x731"></a>        connect( s, SIGNAL(<a href="qsocket.html#readyRead">readyRead</a>()), this, SLOT(readClient()) );
<a name="x729"></a>        connect( s, SIGNAL(<a href="qsocket.html#delayedCloseFinished">delayedCloseFinished</a>()), this, SLOT(discardClient()) );
<a name="x732"></a>        s-&gt;<a href="qsocket.html#setSocket">setSocket</a>( 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.
        <a href="qsocket.html">QSocket</a>* socket = (QSocket*)sender();
<a name="x727"></a>        if ( socket-&gt;<a href="qsocket.html#canReadLine">canReadLine</a>() ) {
<a name="x733"></a><a name="x730"></a>            <a href="qstringlist.html">QStringList</a> tokens = QStringList::<a href="qstringlist.html#split">split</a>( QRegExp("[ \r\n][ \r\n]*"), socket-&gt;<a href="qsocket.html#readLine">readLine</a>() );
            if ( tokens[0] == "GET" ) {
                <a href="qtextstream.html">QTextStream</a> os( socket );
<a name="x735"></a>                os.<a href="qtextstream.html#setEncoding">setEncoding</a>( QTextStream::UnicodeUTF8 );
                os &lt;&lt; "HTTP/1.0 200 Ok\r\n"
                    "Content-Type: text/html; charset=\"utf-8\"\r\n"
                    "\r\n"
                    "&lt;h1&gt;Nothing to see here&lt;/h1&gt;\n";
<a name="x728"></a>                socket-&gt;<a href="qsocket.html#close">close</a>();
                emit wroteToClient();
            }
        }
    }
    void discardClient()
    {
        <a href="qsocket.html">QSocket</a>* socket = (QSocket*)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 <a href="qvbox.html">QVBox</a>
{
    Q_OBJECT
public:
    HttpInfo()
    {
        HttpDaemon *httpd = new HttpDaemon( this );

        <a href="qstring.html">QString</a> itext = QString(
                "This is a small httpd example.\n"
                "You can connect with your\n"
                "web browser to port %1"
<a name="x726"></a>            ).arg( httpd-&gt;<a href="qserversocket.html#port">port</a>() );
        <a href="qlabel.html">QLabel</a> *lb = new <a href="qlabel.html">QLabel</a>( itext, this );
        lb-&gt;<a href="qlabel.html#setAlignment">setAlignment</a>( AlignHCenter );
        infoText = new <a href="qtextview.html">QTextView</a>( this );
        <a href="qpushbutton.html">QPushButton</a> *quit = new <a href="qpushbutton.html">QPushButton</a>( "quit" , this );

        connect( httpd, SIGNAL(newConnect()), SLOT(newConnect()) );
        connect( httpd, SIGNAL(endConnect()), SLOT(endConnect()) );
        connect( httpd, SIGNAL(wroteToClient()), SLOT(wroteToClient()) );
<a name="x724"></a>        connect( quit, SIGNAL(<a href="qbutton.html#pressed">pressed</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) );
    }

    ~HttpInfo()
    {
    }

private slots:
    void newConnect()
    {
<a name="x734"></a>        infoText-&gt;<a href="qtextedit.html#append">append</a>( "New connection" );
    }
    void endConnect()
    {
        infoText-&gt;<a href="qtextedit.html#append">append</a>( "Connection closed\n\n" );
    }
    void wroteToClient()
    {
        infoText-&gt;<a href="qtextedit.html#append">append</a>( "Wrote to client" );
    }

private:
    <a href="qtextview.html">QTextView</a> *infoText;
};


int main( int argc, char** argv )
{
    <a href="qapplication.html">QApplication</a> app( argc, argv );
    HttpInfo info;
    app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &amp;info );
    info.<a href="qwidget.html#show">show</a>();
    return app.<a href="qapplication.html#exec">exec</a>();
}

#include "httpd.moc"
</pre>

<p>See also <a href="network-examples.html">Network Examples</a>.

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