Question

在 Google Chrome 中，当对服务器的请求发生错误时， Google Chrome 会尝试新请求，请参阅LOG wireshark ： wireshark log

注意：Firefox和InternetExplorer中的第二次尝试也很常见。注意：WebInspector仅出现在请求中，换句话说：传统浏览器会在很多次或一段时间内尝试新请求。

我正在QT开发一个完整的浏览器并意识到如果请求失败，“QWebView”与谷歌浏览器具有相同的行为。

如何重新实现QNetWorkRequest/QNetWorkAccessManager以便像传统浏览器一样工作？

请帮帮我。

myWebPage *myWP = new myWebPage();
myWP->setForwardUnsupportedContent(true);
myWP->setNetworkAccessManager(m_network);
ui->myWebView->setPage(myWP);

if(q!=true) {
    settings = QWebSettings::globalSettings();

    settings->setAttribute(QWebSettings::OfflineWebApplicationCacheEnabled,true);
    settings->setAttribute(QWebSettings::LocalContentCanAccessRemoteUrls,true);
    settings->setAttribute(QWebSettings::OfflineStorageDatabaseEnabled,true);
    settings->setAttribute(QWebSettings::LocalContentCanAccessFileUrls,true);
    settings->setAttribute(QWebSettings::LocalStorageEnabled,true);
    settings->setAttribute(QWebSettings::JavascriptCanOpenWindows,true);
    settings->setAttribute(QWebSettings::JavascriptCanCloseWindows,true);
    settings->setAttribute(QWebSettings::JavascriptEnabled,true);

    settings->setAttribute(QWebSettings::PluginsEnabled,true);
    settings->setAttribute(QWebSettings::JavaEnabled,false);//Disable java
    settings->setAttribute(QWebSettings::DeveloperExtrasEnabled,true);
    settings->setAttribute(QWebSettings::AutoLoadImages, true);


    settings->setAttribute(QWebSettings::DnsPrefetchEnabled, true);
    settings->setAttribute(QWebSettings::LocalStorageDatabaseEnabled, true);
    settings->setAttribute(QWebSettings::AcceleratedCompositingEnabled, true);
    settings->setAttribute(QWebSettings::JavascriptCanAccessClipboard, false);
    settings->setAttribute(QWebSettings::ScrollAnimatorEnabled, true);

    settings->setAttribute(QWebSettings::PrintElementBackgrounds, false);

    settings->setOfflineWebApplicationCachePath(QString(localStorage+"/appcache"));
    settings->enablePersistentStorage(QString(localStorage+"/persistent"));
    settings->setOfflineStoragePath(QString(localStorage+"/offlinestorage"));
    settings->setLocalStoragePath(QString(localStorage+"/storage"));
    settings->setIconDatabasePath(QString(localStorage+"/icons"));

    settings->setMaximumPagesInCache(99999);
    settings->setObjectCacheCapacities(0,99999,99999);

    settings->setOfflineWebApplicationCacheQuota(5*1024*1024);
    settings->setOfflineStorageDefaultQuota(5*1024*1024);
}
connect(ui->myWebView->page(), SIGNAL(downloadRequested(QNetworkRequest)), this, SLOT(Download(QNetworkRequest)));
connect(ui->myWebView->page(), SIGNAL(unsupportedContent(QNetworkReply*)), this, SLOT(unsupportedToDownload(QNetworkReply*)));
connect(ui->myWebView->page(), SIGNAL(printRequested(QWebFrame*)), this, SLOT(printFrame(QWebFrame*)));

Answer 1

我解决了这个问题：

network.h

#ifndef NETWORK_H
#define NETWORK_H

#include <QNetworkAccessManager>

class netWork : public QNetworkAccessManager
{
    Q_OBJECT

protected:
    virtual QNetworkReply *createRequest(Operation op, const QNetworkRequest &request, QIODevice *outgoingData = 0);

public:
    explicit netWork(QObject *parent = 0);
};

#endif // NETWORK_H

network.cpp

#include "network.h"
#include <QNetworkReply>
#include <QNetworkRequest>

netWork::netWork(QObject *parent) :
    QNetworkAccessManager(parent)
{
}

QNetworkReply * netWork::createRequest(Operation op, const QNetworkRequest &request, QIODevice *outgoingData){
    if(request.rawHeader("x-fixed-req")=="1") {//prevent infinite loop
        return QNetworkAccessManager::createRequest(op, request, outgoingData);
    }
    const QList<QByteArray>a = request.rawHeaderList();

    int j = a.length();
    int i=0;

    QNetworkRequest req(request.url());
    for(;i<j;++i){
        req.setRawHeader(a[i], request.rawHeader(a[i]));
    }
    req.setRawHeader("x-fixed-req", "1");

    QNetworkReply *p;
    if(op==PostOperation || op==PutOperation) {
        const QByteArray data = outgoingData->readAll();

        if(op==PostOperation) {
            p = this->post(req, data);
        } else {
            p = this->put(req, data);
        }
    } else if(op==DeleteOperation) {
        p = this->deleteResource(req);
    } else if(op==HeadOperation) {
        p = this->head(req);
    } else {
        p = this->get(req);
    }

    return p;
}

MainWindow.cpp（或其他）

#include "network.h";

bool firstExec = false;
QNetworkCookieJar *cookieJar;

QNetworkDiskCache *m_cache;
netWork *m_network = new netWork; //custom networkaccessmanager

...

if(firstExec==false){
    firstExec = true;
    cookieJar = new QNetworkCookieJar;

    m_cache = new QNetworkDiskCache();
    m_cache->setCacheDirectory( QString("c:\\data") );

    m_network->setCache( m_cache );
    m_network->setCookieJar( cookieJar );

}

[QWEBVIEW]->setNetworkAccessManager( m_network );

注意：要使用cookie和缓存，请使用函数 QNetworkAccessManager :: setCookieJar 和 QNetworkAccessManager :: setCache

请求或AccessManager QT

1 个答案: