[QNetworkAccessManager + QNetworkCookieJar] Cookies are not saved

[Kempo]

Hello!
Objective: To load different pages of one site, with the ability to use previously issued cookie

The simplest application loads the page from localhost.

#include <QtCore>
#include <QApplication>
#include <QDebug>
#include <QtNetwork>
 
class MyCookieJar : public QNetworkCookieJar
{
    public:
        QList<QNetworkCookie> getAllCookies() { return allCookies(); }
};
 
 
class CookiesTest : public QObject
{
    Q_OBJECT
    public:
        CookiesTest(QWidget* parent = 0);
 
    private slots:
        void replyFinished(QNetworkReply*);
 
    private:
        QNetworkAccessManager* manager;
        MyCookieJar *cookieJar;
    };
 
CookiesTest::CookiesTest(QWidget* parent)
{
    manager = new QNetworkAccessManager;
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
 
    cookieJar = new MyCookieJar;
    manager->setCookieJar(cookieJar);
 
    manager->get(QNetworkRequest(QUrl("http://test1.ru/test/cookie.php")));
    manager->get(QNetworkRequest(QUrl("http://test1.ru/test/cookie.php")));
}
 
void CookiesTest::replyFinished(QNetworkReply* reply)
{
    qDebug() << reply->readAll();
    qDebug() << "getAllCookies: " << cookieJar->getAllCookies();
}
 
 
int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    CookiesTest cookiesTest;
    return app.exec();
}
 
#include "main.moc"

#include <QtCore>
#include <QApplication>
#include <QDebug>
#include <QtNetwork>

class MyCookieJar : public QNetworkCookieJar
{
    public:
        QList<QNetworkCookie> getAllCookies() { return allCookies(); }
};


class CookiesTest : public QObject
{
    Q_OBJECT
    public:
        CookiesTest(QWidget* parent = 0);

    private slots:
        void replyFinished(QNetworkReply*);

    private:
        QNetworkAccessManager* manager;
        MyCookieJar *cookieJar;
    };

CookiesTest::CookiesTest(QWidget* parent)
{
    manager = new QNetworkAccessManager;
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));

    cookieJar = new MyCookieJar;
    manager->setCookieJar(cookieJar);

    manager->get(QNetworkRequest(QUrl("http://test1.ru/test/cookie.php")));
    manager->get(QNetworkRequest(QUrl("http://test1.ru/test/cookie.php")));
}

void CookiesTest::replyFinished(QNetworkReply* reply)
{
    qDebug() << reply->readAll();
    qDebug() << "getAllCookies: " << cookieJar->getAllCookies();
}


int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    CookiesTest cookiesTest;
    return app.exec();
}

#include "main.moc"

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in the file .pro: QT += network

File cookie.php shows number of visits that page on the analysis of the cookie

<?php
if (isset($_COOKIE['Mortal'])) $cnt = $_COOKIE['Mortal'] + 1;
else $cnt = 1;
 
setcookie("Mortal",$cnt,0x6FFFFFFF);
echo "NUM: [".@$_COOKIE['Mortal']."]";
?>

<?php
if (isset($_COOKIE['Mortal'])) $cnt = $_COOKIE['Mortal'] + 1;
else $cnt = 1;

setcookie("Mortal",$cnt,0x6FFFFFFF);
echo "NUM: [".@$_COOKIE['Mortal']."]";
?>

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Output:

"NUM: []"
getAllCookies: (QNetworkCookie("Mortal=1; expires=Wed, 18-Jul-2029 05:49:51 GMT; domain=test1.ru; path=/test/") )
"NUM: []"
getAllCookies: (QNetworkCookie("Mortal=1; expires=Wed, 18-Jul-2029 05:49:51 GMT; domain=test1.ru; path=/test/") )

Although to be the second time in brackets the number 1 and the second getAllCookies: Mortal = 2

Tell me please, where was the mistake, what's wrong? Why cookies are not stored on the 2nd request

[ChrisW67]

At the time you issue your two asynchronous network requests the cookie jar is empty. Both requests go to the server without a cookie and come back with the same Mortal=1 value. The PHP end is working correctly.

This version waits three seconds before issuing the second request:

#include <QtCore>
#include <QApplication>
#include <QDebug>
#include <QtNetwork>
 
class MyCookieJar : public QNetworkCookieJar
{
    public:
        QList<QNetworkCookie> getAllCookies() { return allCookies(); }
};
 
 
class CookiesTest : public QObject
{
    Q_OBJECT
    public:
        CookiesTest(QWidget* parent = 0);
 
    private slots:
        void replyFinished(QNetworkReply*);
        void doAnother();
 
    private:
        QNetworkAccessManager* manager;
        MyCookieJar *cookieJar;
    };
 
CookiesTest::CookiesTest(QWidget* parent)
{
    manager = new QNetworkAccessManager;
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
 
    cookieJar = new MyCookieJar;
    manager->setCookieJar(cookieJar);
 
    manager->get(QNetworkRequest(QUrl("http://ptolemy/test.php")));
    QTimer::singleShot(3000, this, SLOT(doAnother()));
}
 
void CookiesTest::replyFinished(QNetworkReply* reply)
{
    qDebug() << reply->readAll();
    qDebug() << "getAllCookies: " << cookieJar->getAllCookies();
}
 
void CookiesTest::doAnother() {
    manager->get(QNetworkRequest(QUrl("http://ptolemy/test.php")));
}        
 
int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    CookiesTest cookiesTest;
    return app.exec();
}
 
#include "main.moc"

#include <QtCore>
#include <QApplication>
#include <QDebug>
#include <QtNetwork>

class MyCookieJar : public QNetworkCookieJar
{
    public:
        QList<QNetworkCookie> getAllCookies() { return allCookies(); }
};


class CookiesTest : public QObject
{
    Q_OBJECT
    public:
        CookiesTest(QWidget* parent = 0);

    private slots:
        void replyFinished(QNetworkReply*);
        void doAnother();

    private:
        QNetworkAccessManager* manager;
        MyCookieJar *cookieJar;
    };

CookiesTest::CookiesTest(QWidget* parent)
{
    manager = new QNetworkAccessManager;
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));

    cookieJar = new MyCookieJar;
    manager->setCookieJar(cookieJar);

    manager->get(QNetworkRequest(QUrl("http://ptolemy/test.php")));
    QTimer::singleShot(3000, this, SLOT(doAnother()));
}

void CookiesTest::replyFinished(QNetworkReply* reply)
{
    qDebug() << reply->readAll();
    qDebug() << "getAllCookies: " << cookieJar->getAllCookies();
}

void CookiesTest::doAnother() {
    manager->get(QNetworkRequest(QUrl("http://ptolemy/test.php")));
}        

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    CookiesTest cookiesTest;
    return app.exec();
}

#include "main.moc"

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[Kempo]

Thank you very much ChrisW67! It works.

Perhaps I still misunderstand something, but that's an option for some reason just does not work, cookies Mortal = 1

#include <QtCore>
#include <QApplication>
#include <QDebug>
#include <QtNetwork>
 
class MyCookieJar : public QNetworkCookieJar
{
public:
    QList<QNetworkCookie> getAllCookies() { return allCookies(); }
};
 
 
class CookiesTest : public QObject
{
Q_OBJECT
public:
    CookiesTest(QWidget* parent = 0);
    void download(QString);
 
private slots:
    void replyFinished(QNetworkReply*);
    void doAnother();
 
private:
    QNetworkAccessManager* manager;
    MyCookieJar *cookieJar;
    QUrl myUrl;
};
 
CookiesTest::CookiesTest(QWidget* parent)
{
    manager = new QNetworkAccessManager;
    cookieJar = new MyCookieJar;
    manager->setCookieJar(cookieJar);
 
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
}
 
void CookiesTest::replyFinished(QNetworkReply* reply)
{
    qDebug() << reply->readAll();
    qDebug() << "getAllCookies: " << cookieJar->getAllCookies();
}
 
void CookiesTest::doAnother() {
    manager->get(QNetworkRequest(myUrl));
}
 
void CookiesTest::download(QString url)
{
    myUrl = QUrl(url);
    QTimer::singleShot(500, this, SLOT(doAnother()));
}
 
int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    CookiesTest cookiesTest;
    cookiesTest.download("http://test1.ru/test/cookie.php");
    cookiesTest.download("http://test1.ru/test/cookie.php");
    return app.exec();
}
 
#include "main.moc"

#include <QtCore>
#include <QApplication>
#include <QDebug>
#include <QtNetwork>

class MyCookieJar : public QNetworkCookieJar
{
public:
    QList<QNetworkCookie> getAllCookies() { return allCookies(); }
};


class CookiesTest : public QObject
{
Q_OBJECT
public:
    CookiesTest(QWidget* parent = 0);
    void download(QString);

private slots:
    void replyFinished(QNetworkReply*);
    void doAnother();

private:
    QNetworkAccessManager* manager;
    MyCookieJar *cookieJar;
    QUrl myUrl;
};

CookiesTest::CookiesTest(QWidget* parent)
{
    manager = new QNetworkAccessManager;
    cookieJar = new MyCookieJar;
    manager->setCookieJar(cookieJar);

    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
}

void CookiesTest::replyFinished(QNetworkReply* reply)
{
    qDebug() << reply->readAll();
    qDebug() << "getAllCookies: " << cookieJar->getAllCookies();
}

void CookiesTest::doAnother() {
    manager->get(QNetworkRequest(myUrl));
}

void CookiesTest::download(QString url)
{
    myUrl = QUrl(url);
    QTimer::singleShot(500, this, SLOT(doAnother()));
}

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    CookiesTest cookiesTest;
    cookiesTest.download("http://test1.ru/test/cookie.php");
    cookiesTest.download("http://test1.ru/test/cookie.php");
    return app.exec();
}

#include "main.moc"

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Output:

"NUM: []"
getAllCookies: (QNetworkCookie("Mortal=1; expires=Wed, 18-Jul-2029 05:49:51 GMT; domain=test1.ru; path=/test/") )
"NUM: []"
getAllCookies: (QNetworkCookie("Mortal=1; expires=Wed, 18-Jul-2029 05:49:51 GMT; domain=test1.ru; path=/test/") )

But I found another solution to this

#include <QtCore>
#include <QApplication>
#include <QDebug>
#include <QtNetwork>
 
 
class MyCookieJar : public QNetworkCookieJar
{
public:
    QList<QNetworkCookie> getAllCookies() { return allCookies(); }
};
 
 
class CookiesTest : public QObject
{
    Q_OBJECT
public:
    CookiesTest(QObject *parent = 0);
    void download(QString);
    void _download(QUrl);
 
private:
    QNetworkAccessManager* manager;
    MyCookieJar *cookieJar;
    QList<QNetworkCookie> cookiesList;
};
 
CookiesTest::CookiesTest(QObject *parent) : QObject(parent)
{
    manager = new QNetworkAccessManager;
    cookieJar = new MyCookieJar();
    manager->setCookieJar(cookieJar);
}
 
void CookiesTest::download(QString url)
{
    _download(QUrl(url));
}
 
void CookiesTest::_download(QUrl url)
{
    //enters event loop, simulate blocking io
    QEventLoop q;
    QTimer t;
    t.setSingleShot(true);
    connect(&t, SIGNAL(timeout()), &q, SLOT(quit()));
 
    QNetworkReply *reply = manager->get(QNetworkRequest(url));
    connect(reply, SIGNAL(finished()), &q, SLOT(quit()));
 
    t.start(5000);
    q.exec();
 
    if (t.isActive()) {
        t.stop();
        QByteArray response = reply->readAll();
        qDebug() << response;
 
        QVariant redirectionTarget = reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
        if (reply->error()) {
            qDebug()<< "Download failed" <<  reply->errorString();
        } else if (!redirectionTarget.isNull()) {
            QUrl newUrl = url.resolved(redirectionTarget.toUrl());
            qDebug()<< "Redirect to" <<  newUrl.toString();
            url = newUrl;
            // reply->deleteLater();
            _download(url);
        } else {
            qDebug() << "Finish! ";
        }
 
        reply->deleteLater();
 
    } else {
        qDebug() << "Timeout";
    }
 
    cookiesList = cookieJar->getAllCookies();
    qDebug() << "getAllCookies: " << cookiesList;
}
 
int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    CookiesTest cookiesTest;
    cookiesTest.download("http://test1.ru/test/cookie.php");
    cookiesTest.download("http://test1.ru/test/cookie.php");
    cookiesTest.download("http://test1.ru/test/cookie.php");
    return app.exec();
}
 
#include "main.moc"

#include <QtCore>
#include <QApplication>
#include <QDebug>
#include <QtNetwork>


class MyCookieJar : public QNetworkCookieJar
{
public:
    QList<QNetworkCookie> getAllCookies() { return allCookies(); }
};


class CookiesTest : public QObject
{
    Q_OBJECT
public:
    CookiesTest(QObject *parent = 0);
    void download(QString);
    void _download(QUrl);

private:
    QNetworkAccessManager* manager;
    MyCookieJar *cookieJar;
    QList<QNetworkCookie> cookiesList;
};

CookiesTest::CookiesTest(QObject *parent) : QObject(parent)
{
    manager = new QNetworkAccessManager;
    cookieJar = new MyCookieJar();
    manager->setCookieJar(cookieJar);
}

void CookiesTest::download(QString url)
{
    _download(QUrl(url));
}

void CookiesTest::_download(QUrl url)
{
    //enters event loop, simulate blocking io
    QEventLoop q;
    QTimer t;
    t.setSingleShot(true);
    connect(&t, SIGNAL(timeout()), &q, SLOT(quit()));

    QNetworkReply *reply = manager->get(QNetworkRequest(url));
    connect(reply, SIGNAL(finished()), &q, SLOT(quit()));

    t.start(5000);
    q.exec();

    if (t.isActive()) {
        t.stop();
        QByteArray response = reply->readAll();
        qDebug() << response;

        QVariant redirectionTarget = reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
        if (reply->error()) {
            qDebug()<< "Download failed" <<  reply->errorString();
        } else if (!redirectionTarget.isNull()) {
            QUrl newUrl = url.resolved(redirectionTarget.toUrl());
            qDebug()<< "Redirect to" <<  newUrl.toString();
            url = newUrl;
            // reply->deleteLater();
            _download(url);
        } else {
            qDebug() << "Finish! ";
        }

        reply->deleteLater();

    } else {
        qDebug() << "Timeout";
    }

    cookiesList = cookieJar->getAllCookies();
    qDebug() << "getAllCookies: " << cookiesList;
}

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    CookiesTest cookiesTest;
    cookiesTest.download("http://test1.ru/test/cookie.php");
    cookiesTest.download("http://test1.ru/test/cookie.php");
    cookiesTest.download("http://test1.ru/test/cookie.php");
    return app.exec();
}

#include "main.moc"

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Output:

"NUM: []"
Finish!
getAllCookies: (QNetworkCookie("Mortal=1; expires=Wed, 18-Jul-2029 05:49:51 GMT; domain=test1.ru; path=/test/") )
"NUM: [1]"
Finish!
getAllCookies: (QNetworkCookie("Mortal=2; expires=Wed, 18-Jul-2029 05:49:51 GMT; domain=test1.ru; path=/test/") )
"NUM: [2]"
Finish!
getAllCookies: (QNetworkCookie("Mortal=3; expires=Wed, 18-Jul-2029 05:49:51 GMT; domain=test1.ru; path=/test/") )