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diff --git a/src/network/access/qnetworkaccessdebugpipebackend.cpp b/src/network/access/qnetworkaccessdebugpipebackend.cpp
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+++ b/src/network/access/qnetworkaccessdebugpipebackend.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtNetwork module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qnetworkaccessdebugpipebackend_p.h"
+#include "QtCore/qdatastream.h"
+
+QT_BEGIN_NAMESPACE
+
+#ifdef QT_BUILD_INTERNAL
+
+enum {
+    ReadBufferSize = 16384,
+    WriteBufferSize = ReadBufferSize
+};
+
+struct QNetworkAccessDebugPipeBackend::DataPacket
+{
+    QList<QPair<QByteArray, QByteArray> > headers;
+    QByteArray data;
+};
+
+QNetworkAccessBackend *
+QNetworkAccessDebugPipeBackendFactory::create(QNetworkAccessManager::Operation op,
+                                              const QNetworkRequest &request) const
+{
+    // is it an operation we know of?
+    switch (op) {
+    case QNetworkAccessManager::GetOperation:
+    case QNetworkAccessManager::PutOperation:
+        break;
+
+    default:
+        // no, we can't handle this operation
+        return 0;
+    }
+
+    QUrl url = request.url();
+    if (url.scheme() == QLatin1String("debugpipe"))
+        return new QNetworkAccessDebugPipeBackend;
+    return 0;
+}
+
+QNetworkAccessDebugPipeBackend::QNetworkAccessDebugPipeBackend()
+    : incomingPacketSize(0), bareProtocol(false)
+{
+}
+
+QNetworkAccessDebugPipeBackend::~QNetworkAccessDebugPipeBackend()
+{
+    socket.disconnect(this);    // we're not interested in the signals at this point
+}
+
+void QNetworkAccessDebugPipeBackend::open()
+{
+    socket.connectToHost(url().host(), url().port(12345));
+    socket.setReadBufferSize(ReadBufferSize);
+    connect(&socket, SIGNAL(readyRead()), SLOT(socketReadyRead()));
+    connect(&socket, SIGNAL(bytesWritten(qint64)), SLOT(socketBytesWritten(qint64)));
+    connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)), SLOT(socketError()));
+    connect(&socket, SIGNAL(disconnected()), SLOT(socketDisconnected()));
+
+    bareProtocol = url().queryItemValue(QLatin1String("bare")) == QLatin1String("1");
+
+    if (!bareProtocol) {
+        // "Handshake":
+        // send outgoing metadata and the URL being requested
+        DataPacket packet;
+        //packet.metaData = request().metaData();
+        packet.data = url().toEncoded();
+        send(packet);
+    }
+}
+
+void QNetworkAccessDebugPipeBackend::closeDownstreamChannel()
+{
+    if (operation() == QNetworkAccessManager::GetOperation)
+        socket.disconnectFromHost();
+}
+
+void QNetworkAccessDebugPipeBackend::closeUpstreamChannel()
+{
+    if (operation() == QNetworkAccessManager::PutOperation)
+        socket.disconnectFromHost();
+    else if (operation() == QNetworkAccessManager::PostOperation) {
+        send(DataPacket());
+    }
+}
+
+bool QNetworkAccessDebugPipeBackend::waitForDownstreamReadyRead(int ms)
+{
+    readyReadEmitted = false;
+    if (socket.bytesAvailable()) {
+        socketReadyRead();
+        if (readyReadEmitted)
+            return true;
+    }
+    socket.waitForReadyRead(ms);
+    return readyReadEmitted;
+}
+
+bool QNetworkAccessDebugPipeBackend::waitForUpstreamBytesWritten(int ms)
+{
+    bytesWrittenEmitted = false;
+    upstreamReadyRead();
+    if (bytesWrittenEmitted)
+        return true;
+
+    socket.waitForBytesWritten(ms);
+    return bytesWrittenEmitted;
+}
+
+void QNetworkAccessDebugPipeBackend::upstreamReadyRead()
+{
+    int maxWrite = WriteBufferSize - socket.bytesToWrite();
+    if (maxWrite <= 0)
+        return;                 // can't write yet, wait for the socket to write
+
+    if (bareProtocol) {
+        QByteArray data = readUpstream();
+        if (data.isEmpty())
+            return;
+
+        socket.write(data);
+        upstreamBytesConsumed(data.size());
+        bytesWrittenEmitted = true;
+        return;
+    }
+
+    DataPacket packet;
+    packet.data = readUpstream();
+    if (packet.data.isEmpty())
+        return;                 // we'll be called again when there's data
+    if (packet.data.size() > maxWrite)
+        packet.data.truncate(maxWrite);
+
+    if (!send(packet)) {
+        QString msg = QObject::tr("Write error writing to %1: %2")
+                      .arg(url().toString(), socket.errorString());
+        error(QNetworkReply::ProtocolFailure, msg);
+
+        finished();
+        return;
+    }
+    upstreamBytesConsumed(packet.data.size());
+    bytesWrittenEmitted = true;
+}
+
+void QNetworkAccessDebugPipeBackend::downstreamReadyWrite()
+{
+    socketReadyRead();
+}
+
+void QNetworkAccessDebugPipeBackend::socketReadyRead()
+{
+    if (bareProtocol) {
+        qint64 bytesToRead = socket.bytesAvailable();
+        if (bytesToRead) {
+            QByteArray buffer;
+            buffer.resize(bytesToRead);
+            qint64 bytesRead = socket.read(buffer.data(), bytesToRead);
+            if (bytesRead < bytesToRead)
+                buffer.truncate(bytesRead);
+            writeDownstreamData(buffer);
+            readyReadEmitted = true;
+        }
+        return;
+    }
+
+    while (canReceive() &&
+           (socket.state() == QAbstractSocket::UnconnectedState || nextDownstreamBlockSize())) {
+        DataPacket packet;
+        if (receive(packet)) {
+            if (!packet.headers.isEmpty()) {
+                QList<QPair<QByteArray, QByteArray> >::ConstIterator
+                    it = packet.headers.constBegin(),
+                    end = packet.headers.constEnd();
+                for ( ; it != end; ++it)
+                    setRawHeader(it->first, it->second);
+                metaDataChanged();
+            }
+
+            if (!packet.data.isEmpty()) {
+                writeDownstreamData(packet.data);
+                readyReadEmitted = true;
+            }
+
+            if (packet.headers.isEmpty() && packet.data.isEmpty()) {
+                // it's an eof
+                socket.close();
+                readyReadEmitted = true;
+            }
+        } else {
+            // got an error
+            QString msg = QObject::tr("Read error reading from %1: %2")
+                          .arg(url().toString(), socket.errorString());
+            error(QNetworkReply::ProtocolFailure, msg);
+
+            finished();
+            return;
+        }
+    }
+}
+
+void QNetworkAccessDebugPipeBackend::socketBytesWritten(qint64)
+{
+    upstreamReadyRead();
+}
+
+void QNetworkAccessDebugPipeBackend::socketError()
+{
+    QNetworkReply::NetworkError code;
+    switch (socket.error()) {
+    case QAbstractSocket::RemoteHostClosedError:
+        return;                 // socketDisconnected will be called
+
+    case QAbstractSocket::NetworkError:
+        code = QNetworkReply::UnknownNetworkError;
+        break;
+
+    default:
+        code = QNetworkReply::ProtocolFailure;
+        break;
+    }
+
+    error(code, QObject::tr("Socket error on %1: %2")
+          .arg(url().toString(), socket.errorString()));
+    finished();
+    disconnect(&socket, SIGNAL(disconnected()), this, SLOT(socketDisconnected()));
+
+}
+
+void QNetworkAccessDebugPipeBackend::socketDisconnected()
+{
+    socketReadyRead();
+    if (incomingPacketSize == 0 && socket.bytesToWrite() == 0) {
+        // normal close
+        finished();
+    } else {
+        // abnormal close
+        QString msg = QObject::tr("Remote host closed the connection prematurely on %1")
+                             .arg(url().toString());
+        error(QNetworkReply::RemoteHostClosedError, msg);
+
+        finished();
+    }
+}
+
+bool QNetworkAccessDebugPipeBackend::send(const DataPacket &packet)
+{
+    QByteArray ba;
+    {
+        QDataStream stream(&ba, QIODevice::WriteOnly);
+        stream.setVersion(QDataStream::Qt_4_4);
+
+        stream << packet.headers << packet.data;
+    }
+
+    qint32 outgoingPacketSize = ba.size();
+    qint64 written = socket.write((const char*)&outgoingPacketSize, sizeof outgoingPacketSize);
+    written += socket.write(ba);
+    return quint64(written) == (outgoingPacketSize + sizeof outgoingPacketSize);
+}
+
+bool QNetworkAccessDebugPipeBackend::receive(DataPacket &packet)
+{
+    if (!canReceive())
+        return false;
+
+    // canReceive() does the setting up for us
+    Q_ASSERT(socket.bytesAvailable() >= incomingPacketSize);
+    QByteArray incomingPacket = socket.read(incomingPacketSize);
+    QDataStream stream(&incomingPacket, QIODevice::ReadOnly);
+    stream.setVersion(QDataStream::Qt_4_4);
+    stream >> packet.headers >> packet.data;
+
+    // reset for next packet:
+    incomingPacketSize = 0;
+    socket.setReadBufferSize(ReadBufferSize);
+    return true;
+}
+
+bool QNetworkAccessDebugPipeBackend::canReceive()
+{
+    if (incomingPacketSize == 0) {
+        // read the packet size
+        if (quint64(socket.bytesAvailable()) >= sizeof incomingPacketSize)
+            socket.read((char*)&incomingPacketSize, sizeof incomingPacketSize);
+        else
+            return false;
+    }
+
+    if (incomingPacketSize == 0) {
+        QString msg = QObject::tr("Protocol error: packet of size 0 received");
+        error(QNetworkReply::ProtocolFailure, msg);
+        finished();
+
+        socket.blockSignals(true);
+        socket.abort();
+        socket.blockSignals(false);
+        return false;
+    }
+
+    return socket.bytesAvailable() >= incomingPacketSize;
+}
+
+#endif
+
+QT_END_NAMESPACE