[Qt-interest] Qt 4.5.0 WebKit not loading resources that were loaded by 4.4.3

[Rush Manbert]

My test platform is Mac OSX 10.5.6 with Xcode 3.1.2.

I have a small web browser application that is a prototype for a much  
more complicated web browser application. The simple version always  
loads the same HTML. The web page that the HTML defines loads an  
external CSS file, an external JavaScript file, and a number of  
images, each in one of the supported image formats. The JavaScript  
causes the images to move on the page, the CSS causes the div that  
contains the images to have a purple background, and each image  
includes text that identifies its format. This all makes it easy to  
tell whether all of the content was loaded.

Because of the way the complicated browser works, we implemented this  
by deriving from QNetworkAccessManager and overriding its  
createRequest() method. We also derived from QNetworkReply so that we  
could override its readData() and bytesAvailable() methods, among  
others.

The createRequest() override instantiates our NetworkReply class and  
gives it a pointer to the rendered HTML. The NetworkReply::readData()  
method returns the HTML string in however many chunks are required.  
The current implementation is a fairly short string, so it only gets  
called once and it just returns the whole thing.

I have been using qmake to read my .pro file and make Xcode projects.  
I have tested this using Qt 4.4.3 and 4.5.0. Both of my Qt  
installations use the -static configuration, so I am using static  
libraries.

The biggest difference that I see between Qt 4.4.3 and 4.5.0 is that  
my app built against 4.4.3 loads all of the external resources and  
behaves as I expect. When I build it against 4.5.0 it loads none of  
the external resources. The HTML is being read and interpreted,  
because it contains a <button> element that shows up, but everything  
else is missing.

Do I need to implement something else for Qt 4.5.0 in order to get my  
resources loaded? The biggest difference I see between the 4.4.3 and  
4.5.0 sources is the new caching, so I am wondering whether I need to  
implement some sort of custom cache, or hook up a default cache. Any  
help would be greatly appreciated. I can furnish my source, or the  
entire project directory as a 16k ZIP file.

Thanks,
Rush