Issue with http server implementation on S60 platform

[ada10]

I am facing some issue related to http file download using QT APIs. My simple HTTP Client application sends a HTTP get request using QNetworkRequest. The code is as shown below –

QNetworkAccessManager * manager = new QNetworkAccessManager(this); 
QNetworkRequest getReq;
             getReq.setUrl( QUrl( fileurl ) );    
 
        QNetworkReply *reply = manager->get( getReq );
        connect( reply, SIGNAL( readyRead()),this,SLOT( moreData()));
 
            connect( reply, SIGNAL( error ( QNetworkReply::NetworkError ) ),
                           this,SLOT( errorInTransaction( QNetworkReply::NetworkError ) ) );

QNetworkAccessManager * manager = new QNetworkAccessManager(this); 
QNetworkRequest getReq;
             getReq.setUrl( QUrl( fileurl ) );    
 
        QNetworkReply *reply = manager->get( getReq );
        connect( reply, SIGNAL( readyRead()),this,SLOT( moreData()));
 
            connect( reply, SIGNAL( error ( QNetworkReply::NetworkError ) ),
                           this,SLOT( errorInTransaction( QNetworkReply::NetworkError ) ) );

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I have tested the client application using simple QT Http Server implementation ( which uses QTcpServer API ).
The client is able to download small sized files ( < 1MB ), but when I try to download large files ( > 1MB ) , there is an error on the server side & client application does not get the file contents.
This is the scenario when I run both applications on the phone. Has someone faced this issue and come up with probable solutions ?

The server code is as shown below –

serverwindow::serverwindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::serverwindow),clientConnection(0)
{
    ui->setupUi(this);
    ui->textEdit->append("\nServer started");
 
     tcpServer = new QTcpServer(this);
     ui->textEdit->append("\nServer listening for connections ....");
 
     tcpServer->listen(QHostAddress::Any,80);
     connect(tcpServer, SIGNAL(newConnection()), this, SLOT(AcceptClientConn()));
}
 
//----------------  AcceptClientConn() ------------------
 
 
void serverwindow::AcceptClientConn()
{
    ui->textEdit->append("\nNew client connection received");
 
    clientConnection = tcpServer->nextPendingConnection();
 
    connect(clientConnection, SIGNAL(disconnected()),
                clientConnection, SLOT(deleteLater()));
 
    connect( clientConnection, SIGNAL(readyRead()),
             this, SLOT(readClient()) );
 
}
 
//-------------------------------------- readClient() -------------------------
void serverwindow::readClient()
{
//read the data obtained from client
 
 
    QTcpSocket* clientSocket = (QTcpSocket*)sender();
 
    if(clientSocket->canReadLine())
    {
            QString curData(clientSocket->readLine());
        QStringList tokens = curData.split(QRegExp("[ \r\n][ \r\n]*"));
        if ( tokens[0] == "GET" )
        {
 
            //try to send a file's contents
 
            //6. song file
            QFile htmlfile("c:\\server_files\\song.mp3");   //3MB file
            if (!htmlfile.open(QIODevice::ReadOnly))
                     return;
 
            QByteArray block = htmlfile.readAll(); 
            int sz = block.size();
 
            QString content_type = "audio/mpeg;";
            QTextStream os( clientSocket );
            os << "HTTP/1.0 200 Ok\r\n"
                  "Content-Type: "<< content_type
                  <<"charset=\"utf-8\"\r\n"
                  <<"Content-Length: "<<sz
                  "\r\n\r\n";
            os.flush();
 
            // Streaming the file
 
            clientSocket->write(block);            
 
         }
    }
    clientSocket->close();
}

serverwindow::serverwindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::serverwindow),clientConnection(0)
{
    ui->setupUi(this);
    ui->textEdit->append("\nServer started");
 
     tcpServer = new QTcpServer(this);
     ui->textEdit->append("\nServer listening for connections ....");
 
     tcpServer->listen(QHostAddress::Any,80);
     connect(tcpServer, SIGNAL(newConnection()), this, SLOT(AcceptClientConn()));
}
 
//----------------  AcceptClientConn() ------------------
 
 
void serverwindow::AcceptClientConn()
{
    ui->textEdit->append("\nNew client connection received");
 
    clientConnection = tcpServer->nextPendingConnection();
 
    connect(clientConnection, SIGNAL(disconnected()),
                clientConnection, SLOT(deleteLater()));
 
    connect( clientConnection, SIGNAL(readyRead()),
             this, SLOT(readClient()) );
 
}
 
//-------------------------------------- readClient() -------------------------
void serverwindow::readClient()
{
//read the data obtained from client
 
 
    QTcpSocket* clientSocket = (QTcpSocket*)sender();
 
    if(clientSocket->canReadLine())
    {
            QString curData(clientSocket->readLine());
        QStringList tokens = curData.split(QRegExp("[ \r\n][ \r\n]*"));
        if ( tokens[0] == "GET" )
        {
 
            //try to send a file's contents
 
            //6. song file
            QFile htmlfile("c:\\server_files\\song.mp3");   //3MB file
            if (!htmlfile.open(QIODevice::ReadOnly))
                     return;

            QByteArray block = htmlfile.readAll(); 
            int sz = block.size();

            QString content_type = "audio/mpeg;";
            QTextStream os( clientSocket );
            os << "HTTP/1.0 200 Ok\r\n"
                  "Content-Type: "<< content_type
                  <<"charset=\"utf-8\"\r\n"
                  <<"Content-Length: "<<sz
                  "\r\n\r\n";
            os.flush();
 
            // Streaming the file
                       
            clientSocket->write(block);            
 
         }
    }
    clientSocket->close();
}

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