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diff --git a/src/network/access/qhsts_p.h b/src/network/access/qhsts_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtNetwork module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QHSTS_P_H
+#define QHSTS_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of the Network Access API.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtNetwork/qhstspolicy.h>
+
+#include <QtCore/qbytearray.h>
+#include <QtCore/qdatetime.h>
+#include <QtCore/qstring.h>
+#include <QtCore/qglobal.h>
+#include <QtCore/qpair.h>
+#include <QtCore/qurl.h>
+#include <QtCore/qmap.h>
+
+QT_BEGIN_NAMESPACE
+
+template<typename T> class QList;
+template <typename T> class QVector;
+
+class Q_AUTOTEST_EXPORT QHstsCache
+{
+public:
+
+    void updateFromHeaders(const QList<QPair<QByteArray, QByteArray>> &headers,
+                           const QUrl &url);
+    void updateFromPolicies(const QVector<QHstsPolicy> &hosts);
+    void updateKnownHost(const QUrl &url, const QDateTime &expires,
+                         bool includeSubDomains);
+    bool isKnownHost(const QUrl &url) const;
+    void clear();
+
+    QVector<QHstsPolicy> policies() const;
+
+private:
+
+    void updateKnownHost(const QString &hostName, const QDateTime &expires,
+                         bool includeSubDomains);
+
+    struct HostName
+    {
+        explicit HostName(const QString &n) : name(n) { }
+        explicit HostName(const QStringRef &r) : fragment(r) { }
+
+        bool operator < (const HostName &rhs) const
+        {
+            if (fragment.size()) {
+                if (rhs.fragment.size())
+                    return fragment < rhs.fragment;
+                return fragment < QStringRef(&rhs.name);
+            }
+
+            if (rhs.fragment.size())
+                return QStringRef(&name) < rhs.fragment;
+            return name < rhs.name;
+        }
+
+        // We use 'name' for a HostName object contained in our dictionary;
+        // we use 'fragment' only during lookup, when chopping the complete host
+        // name, removing subdomain names (such HostName object is 'transient', it
+        // must not outlive the original QString object.
+        QString name;
+        QStringRef fragment;
+    };
+
+    mutable QMap<HostName, QHstsPolicy> knownHosts;
+};
+
+class Q_AUTOTEST_EXPORT QHstsHeaderParser
+{
+public:
+
+    bool parse(const QList<QPair<QByteArray, QByteArray>> &headers);
+
+    QDateTime expirationDate() const { return expiry; }
+    bool includeSubDomains() const { return subDomainsFound; }
+
+private:
+
+    bool parseSTSHeader();
+    bool parseDirective();
+    bool processDirective(const QByteArray &name, const QByteArray &value);
+    bool nextToken();
+
+    QByteArray header;
+    QByteArray token;
+
+    QDateTime expiry;
+    int tokenPos = 0;
+    bool maxAgeFound = false;
+    qint64 maxAge = 0;
+    bool subDomainsFound = false;
+};
+
+QT_END_NAMESPACE
+
+#endif