Problems with Cache

[jdarnold]

I can't seem to get the cache to work with our web app. Here's the code i have that should set it up:

@
vNetworkManager = new QNetworkAccessManager(0);
connect(vNetworkManager,SIGNAL(finished(QNetworkReply*)),this,SLOT(replyFinished(QNetworkReply*)));
QNetworkDiskCache* diskCache = new QNetworkDiskCache(this);
diskCache->setCacheDirectory(QDesktopServices::storageLocation(QDesktopServices::CacheLocation));
qDebug() << "Cache directory: " << QDesktopServices::storageLocation(QDesktopServices::CacheLocation);
diskCache->setMaximumCacheSize(1000000); //set the cache to 10megs
vNetworkManager->setCache(diskCache);

setNetworkAccessManager(vNetworkManager);

@

But when I check in replyFinished, it always says false for page from cache:

@void visiWebPage::replyFinished(QNetworkReply *reply) {
QVariant fromCache = reply->attribute(QNetworkRequest::SourceIsFromCacheAttribute);
qDebug() << "page from cache?" << fromCache.toBool();
}
@

Any other magic spell I should be casting to get this to work?

[fcrochik]

Do you see files being created to the "cache directory"?
I have never actually tried to test using "reply->attribute(QNetworkRequest::SourceIsFromCacheAttribute)" but assumed the file was in use because files were being stored on the cache directory.

Also, make sure to test accessing a url that is cacheable. (sorry if it is too obvious of comment)

[fcrochik]

Just tested on my application and, at least on windows7, it works.

@
reply->attribute(QNetworkRequest::SourceIsFromCacheAttribute);
@

returned true form some of the requests.

[goetz]

The server might kind-of "forbid" to save the result in a cache. That does make sense on sites with highly dynamic content.

[jdarnold]

Yes, the files show up in the cache folder but at this point I think it is something in the server set up. I'll let you know when I figure out more.