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diff --git a/src/httpserver/qhttpserverresponder_p.h b/src/httpserver/qhttpserverresponder_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtHttpServer 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 QHTTPSERVERRESPONDER_P_H
+#define QHTTPSERVERRESPONDER_P_H
+
+#include <QtHttpServer/qthttpserverglobal.h>
+#include <QtHttpServer/qhttpserverrequest.h>
+#include <QtHttpServer/qhttpserverresponder.h>
+
+#include <QtCore/qcoreapplication.h>
+#include <QtCore/qpair.h>
+#include <QtCore/qpointer.h>
+#include <QtCore/qsysinfo.h>
+
+#include <type_traits>
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of QHttpServer. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+
+QT_BEGIN_NAMESPACE
+
+class QHttpServerResponderPrivate
+{
+    using StatusCode = QHttpServerResponder::StatusCode;
+
+public:
+    QHttpServerResponderPrivate(const QHttpServerRequest &request, QTcpSocket *const socket) :
+        request(request),
+        socket(socket)
+    {
+        const auto server = QStringLiteral("%1/%2(%3)")
+                .arg(QCoreApplication::instance()->applicationName())
+                .arg(QCoreApplication::instance()->applicationVersion())
+                .arg(QSysInfo::prettyProductName());
+        addHeader(QByteArrayLiteral("Server"), server.toUtf8());
+    }
+
+    inline bool addHeader(const QByteArray &key, const QByteArray &value)
+    {
+        const auto hash = qHash(key.toLower());
+        if (m_headers.contains(hash))
+            return false;
+        m_headers.insert(hash, qMakePair(key, value));
+        return true;
+    }
+
+    void writeStatusLine(StatusCode status = StatusCode::Ok,
+                         const QPair<quint8, quint8> &version = qMakePair(1u, 1u)) const;
+    void writeHeaders() const;
+    void writeBody(const QByteArray &body) const;
+
+    const QHttpServerRequest &request;
+#if defined(QT_DEBUG)
+    const QPointer<QTcpSocket> socket;
+#else
+    QTcpSocket *const socket;
+#endif
+
+    QMap<uint, QPair<QByteArray, QByteArray>> m_headers;
+
+private:
+    void writeHeader(const QByteArray &header, const QByteArray &value) const;
+
+public:
+    const decltype(m_headers) &headers() const { return m_headers; }
+};
+
+QT_END_NAMESPACE
+
+#endif // QHTTPSERVERRESPONDER_P_H