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** This file is part of the QtNetwork module of the Qt Toolkit.
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#ifndef QNETWORKACCESSHTTPBACKEND_P_H
#define QNETWORKACCESSHTTPBACKEND_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 "qhttpnetworkconnection_p.h"
#include "qnetworkaccessbackend_p.h"
#include "qnetworkrequest.h"
#include "qnetworkreply.h"
#include "qabstractsocket.h"

#include "QtCore/qpointer.h"
#include "QtCore/qdatetime.h"

#ifndef QT_NO_HTTP

QT_BEGIN_NAMESPACE

class QNetworkAccessCachedHttpConnection;

class QNetworkAccessHttpBackendIODevice;

class QNetworkAccessHttpBackend: public QNetworkAccessBackend
{
    Q_OBJECT
public:
    QNetworkAccessHttpBackend();
    virtual ~QNetworkAccessHttpBackend();

    virtual void open();
    virtual void closeDownstreamChannel();
    virtual bool waitForDownstreamReadyRead(int msecs);

    virtual void downstreamReadyWrite();
    virtual void copyFinished(QIODevice *);
#ifndef QT_NO_OPENSSL
    virtual void ignoreSslErrors();
    virtual void ignoreSslErrors(const QList<QSslError> &errors);

    virtual void fetchSslConfiguration(QSslConfiguration &configuration) const;
    virtual void setSslConfiguration(const QSslConfiguration &configuration);
#endif
    QNetworkCacheMetaData fetchCacheMetaData(const QNetworkCacheMetaData &metaData) const;

    qint64 deviceReadData(char *buffer, qint64 maxlen);

    // we return true since HTTP needs to send PUT/POST data again after having authenticated
    bool needsResetableUploadData() {return true;};

private slots:
    void replyReadyRead();
    void replyFinished();
    void replyHeaderChanged();
    void httpAuthenticationRequired(const QHttpNetworkRequest &request, QAuthenticator *auth);
    void httpError(QNetworkReply::NetworkError error, const QString &errorString);
    bool sendCacheContents(const QNetworkCacheMetaData &metaData);

private:
    QHttpNetworkReply *httpReply;
    QPointer<QNetworkAccessCachedHttpConnection> http;
    QByteArray cacheKey;
    QNetworkAccessBackendUploadIODevice *uploadDevice;

#ifndef QT_NO_OPENSSL
    QSslConfiguration *pendingSslConfiguration;
    bool pendingIgnoreAllSslErrors;
    QList<QSslError> pendingIgnoreSslErrorsList;
#endif

    void disconnectFromHttp();
    void finished();            // override
    void setupConnection();
    void validateCache(QHttpNetworkRequest &httpRequest, bool &loadedFromCache);
    void invalidateCache();
    void postRequest();
    void readFromHttp();
    void checkForRedirect(const int statusCode);
};

class QNetworkAccessHttpBackendFactory : public QNetworkAccessBackendFactory
{
public:
    virtual QNetworkAccessBackend *create(QNetworkAccessManager::Operation op,
                                          const QNetworkRequest &request) const;
};

QT_END_NAMESPACE

#endif // QT_NO_HTTP

#endif