如何在QtWebKit中获得第一个重定向(301或302)事件

Question

我们正在使用QtWebKit 4.7并想知道帧加载何时进行重定向.

目前我们在QNetworkAccessManager的子类中计算传出请求,我们在其中覆盖createRequest.

这在大多数情况下都很好用,但是当第一个响应是301或302(重定向)时,它会在某处被吞噬.

我们只需要通过以下方式请求网址:

QNetworkRequest request(QUrl("http://www.twitter.com")); // 301 to twitter.com
frame->load(request);

Answer 1

自己处理QNetworkReply,从回复中获取状态代码并执行QWebFrame :: setcontent.

QNetworkRequest request(QUrl("http://www.twitter.com")); // 301 to twitter.com
connect (frame->page()->networkAccessManager(), SIGNAL(finished(QNetworkReply*), this, SLOT(onFinished(QNetworkReply*));
frame->page()->networkAccessManager()->get(request);

[...]

void onFinished(QNetworkReply* reply)
{
    if (reply->error() == QNetworkReply::NoError) {
        int statusCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
        switch (statusCode) {
            case 301:
            case 302:
            case 307:
                qDebug() << "redirected: " << reply->attribute(QNetworkRequest::RedirectionTargetAttribute).toUrl();
                break;

            case 200:
                frame->setContent(reply->readAll());
                break;
        }
    }
}

Answer 2

使用void QWebFrame::urlChanged ( const QUrl & url )信号检测url变化，即重定向，即

QNetworkRequest request(QUrl("http://www.twitter.com")); // 301 to twitter.com
connect(frame, SIGNAL(urlChanged (const QUrl&)), this, SLOT(onRedirected(const QUrl&));
frame->load(request);