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diff --git a/src/network/access/qnetworkaccessauthenticationmanager.cpp b/src/network/access/qnetworkaccessauthenticationmanager.cpp
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+++ b/src/network/access/qnetworkaccessauthenticationmanager.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qnetworkaccessmanager.h"
+#include "qnetworkaccessmanager_p.h"
+#include "qnetworkaccessauthenticationmanager_p.h"
+
+#include "QtCore/qbuffer.h"
+#include "QtCore/qurl.h"
+#include "QtCore/qvector.h"
+#include "QtCore/QMutexLocker"
+#include "QtNetwork/qauthenticator.h"
+
+QT_BEGIN_NAMESPACE
+
+
+
+
+class QNetworkAuthenticationCache: private QVector<QNetworkAuthenticationCredential>,
+                                   public QNetworkAccessCache::CacheableObject
+{
+public:
+    QNetworkAuthenticationCache()
+    {
+        setExpires(false);
+        setShareable(true);
+        reserve(1);
+    }
+
+    QNetworkAuthenticationCredential *findClosestMatch(const QString &domain)
+    {
+        iterator it = qLowerBound(begin(), end(), domain);
+        if (it == end() && !isEmpty())
+            --it;
+        if (it == end() || !domain.startsWith(it->domain))
+            return 0;
+        return &*it;
+    }
+
+    void insert(const QString &domain, const QString &user, const QString &password)
+    {
+        QNetworkAuthenticationCredential *closestMatch = findClosestMatch(domain);
+        if (closestMatch && closestMatch->domain == domain) {
+            // we're overriding the current credentials
+            closestMatch->user = user;
+            closestMatch->password = password;
+        } else {
+            QNetworkAuthenticationCredential newCredential;
+            newCredential.domain = domain;
+            newCredential.user = user;
+            newCredential.password = password;
+
+            if (closestMatch)
+                QVector<QNetworkAuthenticationCredential>::insert(++closestMatch, newCredential);
+            else
+                QVector<QNetworkAuthenticationCredential>::insert(end(), newCredential);
+        }
+    }
+
+    virtual void dispose() { delete this; }
+};
+
+#ifndef QT_NO_NETWORKPROXY
+static QByteArray proxyAuthenticationKey(const QNetworkProxy &proxy, const QString &realm)
+{
+    QUrl key;
+
+    switch (proxy.type()) {
+    case QNetworkProxy::Socks5Proxy:
+        key.setScheme(QLatin1String("proxy-socks5"));
+        break;
+
+    case QNetworkProxy::HttpProxy:
+    case QNetworkProxy::HttpCachingProxy:
+        key.setScheme(QLatin1String("proxy-http"));
+        break;
+
+    case QNetworkProxy::FtpCachingProxy:
+        key.setScheme(QLatin1String("proxy-ftp"));
+        break;
+
+    case QNetworkProxy::DefaultProxy:
+    case QNetworkProxy::NoProxy:
+        // shouldn't happen
+        return QByteArray();
+
+        // no default:
+        // let there be errors if a new proxy type is added in the future
+    }
+
+    if (key.scheme().isEmpty())
+        // proxy type not handled
+        return QByteArray();
+
+    key.setUserName(proxy.user());
+    key.setHost(proxy.hostName());
+    key.setPort(proxy.port());
+    key.setFragment(realm);
+    return "auth:" + key.toEncoded();
+}
+#endif
+
+static inline QByteArray authenticationKey(const QUrl &url, const QString &realm)
+{
+    QUrl copy = url;
+    copy.setFragment(realm);
+    return "auth:" + copy.toEncoded(QUrl::RemovePassword | QUrl::RemovePath | QUrl::RemoveQuery);
+}
+
+
+#ifndef QT_NO_NETWORKPROXY
+void QNetworkAccessAuthenticationManager::cacheProxyCredentials(const QNetworkProxy &p,
+                                                  const QAuthenticator *authenticator)
+{
+    Q_ASSERT(authenticator);
+    Q_ASSERT(p.type() != QNetworkProxy::DefaultProxy);
+    Q_ASSERT(p.type() != QNetworkProxy::NoProxy);
+
+    QMutexLocker mutexLocker(&mutex);
+
+    QString realm = authenticator->realm();
+    QNetworkProxy proxy = p;
+    proxy.setUser(authenticator->user());
+    // Set two credentials: one with the username and one without
+    do {
+        // Set two credentials actually: one with and one without the realm
+        do {
+            QByteArray cacheKey = proxyAuthenticationKey(proxy, realm);
+            if (cacheKey.isEmpty())
+                return;             // should not happen
+
+            QNetworkAuthenticationCache *auth = new QNetworkAuthenticationCache;
+            auth->insert(QString(), authenticator->user(), authenticator->password());
+            authenticationCache.addEntry(cacheKey, auth); // replace the existing one, if there's any
+
+            if (realm.isEmpty()) {
+                break;
+            } else {
+                realm.clear();
+            }
+        } while (true);
+
+        if (proxy.user().isEmpty())
+            break;
+        else
+            proxy.setUser(QString());
+    } while (true);
+}
+
+QNetworkAuthenticationCredential
+QNetworkAccessAuthenticationManager::fetchCachedProxyCredentials(const QNetworkProxy &p,
+                                                     const QAuthenticator *authenticator)
+{
+    QNetworkProxy proxy = p;
+    if (proxy.type() == QNetworkProxy::DefaultProxy) {
+        proxy = QNetworkProxy::applicationProxy();
+    }
+    if (!proxy.password().isEmpty())
+        return QNetworkAuthenticationCredential(); // no need to set credentials if it already has them
+
+    QString realm;
+    if (authenticator)
+        realm = authenticator->realm();
+
+    QMutexLocker mutexLocker(&mutex);
+    QByteArray cacheKey = proxyAuthenticationKey(proxy, realm);
+    if (cacheKey.isEmpty())
+        return QNetworkAuthenticationCredential();
+    if (!authenticationCache.hasEntry(cacheKey))
+        return QNetworkAuthenticationCredential();
+
+    QNetworkAuthenticationCache *auth =
+        static_cast<QNetworkAuthenticationCache *>(authenticationCache.requestEntryNow(cacheKey));
+    QNetworkAuthenticationCredential cred = *auth->findClosestMatch(QString());
+    authenticationCache.releaseEntry(cacheKey);
+
+    // proxy cache credentials always have exactly one item
+    Q_ASSERT_X(!cred.isNull(), "QNetworkAccessManager",
+               "Internal inconsistency: found a cache key for a proxy, but it's empty");
+    return cred;
+}
+
+#endif
+
+void QNetworkAccessAuthenticationManager::cacheCredentials(const QUrl &url,
+                                                  const QAuthenticator *authenticator)
+{
+    Q_ASSERT(authenticator);
+    QString domain = QString::fromLatin1("/"); // FIXME: make QAuthenticator return the domain
+    QString realm = authenticator->realm();
+
+    QMutexLocker mutexLocker(&mutex);
+
+    // Set two credentials actually: one with and one without the username in the URL
+    QUrl copy = url;
+    copy.setUserName(authenticator->user());
+    do {
+        QByteArray cacheKey = authenticationKey(copy, realm);
+        if (authenticationCache.hasEntry(cacheKey)) {
+            QNetworkAuthenticationCache *auth =
+                static_cast<QNetworkAuthenticationCache *>(authenticationCache.requestEntryNow(cacheKey));
+            auth->insert(domain, authenticator->user(), authenticator->password());
+            authenticationCache.releaseEntry(cacheKey);
+        } else {
+            QNetworkAuthenticationCache *auth = new QNetworkAuthenticationCache;
+            auth->insert(domain, authenticator->user(), authenticator->password());
+            authenticationCache.addEntry(cacheKey, auth);
+        }
+
+        if (copy.userName().isEmpty()) {
+            break;
+        } else {
+            copy.setUserName(QString());
+        }
+    } while (true);
+}
+
+/*!
+    Fetch the credential data from the credential cache.
+
+    If auth is 0 (as it is when called from createRequest()), this will try to
+    look up with an empty realm. That fails in most cases for HTTP (because the
+    realm is seldom empty for HTTP challenges). In any case, QHttpNetworkConnection
+    never sends the credentials on the first attempt: it needs to find out what
+    authentication methods the server supports.
+
+    For FTP, realm is always empty.
+*/
+QNetworkAuthenticationCredential
+QNetworkAccessAuthenticationManager::fetchCachedCredentials(const QUrl &url,
+                                                     const QAuthenticator *authentication)
+{
+    if (!url.password().isEmpty())
+        return QNetworkAuthenticationCredential(); // no need to set credentials if it already has them
+
+    QString realm;
+    if (authentication)
+        realm = authentication->realm();
+
+    QByteArray cacheKey = authenticationKey(url, realm);
+
+    QMutexLocker mutexLocker(&mutex);
+    if (!authenticationCache.hasEntry(cacheKey))
+        return QNetworkAuthenticationCredential();
+
+    QNetworkAuthenticationCache *auth =
+        static_cast<QNetworkAuthenticationCache *>(authenticationCache.requestEntryNow(cacheKey));
+    QNetworkAuthenticationCredential cred = *auth->findClosestMatch(url.path());
+    authenticationCache.releaseEntry(cacheKey);
+    return cred;
+}
+
+void QNetworkAccessAuthenticationManager::clearCache()
+{
+    authenticationCache.clear();
+}
+
+QT_END_NAMESPACE
+