How to redirect QWebEngineUrlRequestInfo to local files? - c++

Question

I have a simple Qt application that loads a page in a QWebEngineView. I would like to redirect all http requests with the word "static" in the url to local files. Using WebUrlRequestInterceptor I reimplemented the interceptRequest method. Here is the code:
class MyWebUrlRequestInterceptor : public QWebEngineUrlRequestInterceptor
{
public:
void interceptRequest(QWebEngineUrlRequestInfo &info) {
if (info.requestUrl().toString().contains("static")) {
QString newUrl = QDir::currentPath() + info.requestUrl().toString().mid(21, info.requestUrl().toString().length());
qDebug() << "new url = " << newUrl;
info.redirect(QUrl::fromLocalFile(newUrl));
}
}
};
In main function I did
MyWebUrlRequestInterceptor *wuri = new MyWebUrlRequestInterceptor();
QWebEngineProfile::defaultProfile()->setRequestInterceptor(wuri);
And the interceptRequest seems to work fine, but I get a message.
Not allowed to load local resource
I searched online and I many people are saying that I should add the --disable-web-security flag. So i did in my .pro file:
QMAKE_CXXFLAGS += --disable-web-security
But it doesn't seem to be working. Am I doing something wrong? Is there a different solutions? Could I make custom protocols to serve local files and redirect to them in Qt as a workaround?
I'm using Qt 5.9.1 and QtCreator 4.3.1.

Answer 1

I would block the request using QWebEngineUrlRequestInfo::block and load the local file in the QWebEngineView (even read the local file on the fly and pass its content to the view through QWebEngineView::setHtml).
Or listen locally for incoming http requests, using local dir as web root, and eventually redirect to localhost when needed, which implies using an external web server or building a minimal one, maybe integrated in your app. If you go for integrating it, I would consider this one: https://github.com/cesanta/mongoose.