void QNetworkReplyHttpImplPrivate::postRequest()
{Q_Q(QNetworkReplyHttpImpl);QThread *thread = 0;if (synchronous) {// A synchronous HTTP request uses its own threadthread = new QThread();thread->setObjectName(QStringLiteral("Qt HTTP synchronous thread"));QObject::connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));thread->start();} else if (!managerPrivate->httpThread) {// We use the manager-global thread.// At some point we could switch to having multiple threads if it makes sense.managerPrivate->httpThread = new QThread();managerPrivate->httpThread->setObjectName(QStringLiteral("Qt HTTP thread"));managerPrivate->httpThread->start();thread = managerPrivate->httpThread;} else {// Asynchronous request, thread already existsthread = managerPrivate->httpThread;}..........// Move the delegate to the http threaddelegate->moveToThread(thread);// This call automatically moves the uploadDevice too for the asynchronous case............
}

........// Internal code that does a HTTP reply for the synchronous Ajax// in Qt WebKit.QVariant synchronousHttpAttribute = request.attribute(static_cast<QNetworkRequest::Attribute>(QNetworkRequest::SynchronousRequestAttribute));if (synchronousHttpAttribute.isValid()) {d->synchronous = synchronousHttpAttribute.toBool();
........

QNetworkAccessManagerPrivate::~QNetworkAccessManagerPrivate()
{if (httpThread) {httpThread->quit();httpThread->wait(5000);if (httpThread->isFinished())delete httpThread;elseQObject::connect(httpThread, SIGNAL(finished()), httpThread, SLOT(deleteLater()));httpThread = 0;}
}void QNetworkAccessManagerPrivate::clearCache(QNetworkAccessManager *manager)
{manager->d_func()->objectCache.clear();manager->d_func()->authenticationManager->clearCache();if (manager->d_func()->httpThread) {manager->d_func()->httpThread->quit();manager->d_func()->httpThread->wait(5000);if (manager->d_func()->httpThread->isFinished())delete manager->d_func()->httpThread;elseQObject::connect(manager->d_func()->httpThread, SIGNAL(finished()), manager->d_func()->httpThread, SLOT(deleteLater()));manager->d_func()->httpThread = 0;}
}