QWebEngineView ignores QNetworkProxy with auth (Qt 6.8.1)

SilveRulezz

Hi, community 👋

I have an issue with paid proxy (with auth) and QWebEngineView.

I set up proxy by QNetworkProxy like

QNetworkProxy proxy;
proxy.setType(QNetworkProxy::HttpProxy);
proxy.setHostName("152.217.59.93");
proxy.setPort(5889);
proxy.setUser("proxy_username");
proxy.setPassword("proxy_password");
QNetworkProxy::setApplicationProxy(proxy);

To check the proxy I send requests to https://freeipapi.com/api/json/

When I send HTTP GET request with QNetworkAccessManager then everything is fine and I get the proxy IP. So the proxy is correctly setup by QNetworkProxy::setApplicationProxy and working.

But when I open https://freeipapi.com/api/json/ with QWebEngineView then I get my IP and not the proxy IP. So something went wrong.

I have read https://doc.qt.io/qt-6/qtwebengine-overview.html#proxy-support
and I have connect to QWebEnginePage signal

proxyAuthenticationRequired(const QUrl &requestUrl, QAuthenticator *authenticator, const QString &proxyHost)

where I just set QAuthenticator settings to my proxy vars.

authenticator.setUser("proxy_username");
authenticator.setPassword("proxy_password");

but this signal is never emitted.

Aslo I have tried to create new QWebEnginePage after QNetworkProxy::setApplicationProxy.
I thought maybe the page would pull up the proxy settings when initializing. But this also not working.

Has anyone encountered this? How to solve this issue?