CdpVsNewWindow

Test cases for adding web resource request handlers by the following methods when opening a new window and navigating to a URL.

• Assigning a handler to WebResourceRequested.
• Assigning a handler to Chrome DevTools Protocol events Fetch.requestPaused and Target.autoAttached, then calling Chrome DevTools Protocol methods Fetch.enable and Target.setAutoAttach to enable event hanling.

Settings

• Handler type: Use either WebResourceRequested or Chrome DevTools Protocol Fetch event handlers.
• Add event handlers: sets whether request handlers are assigned before or after calling CoreWebView2NewWindowRequestedEventArgs.NewWindow
• Delay (ms): parameter of an await Task.Delay() call before assigning the handler, which is used to simulate calling other methods between assigning NewWindow and setting up the handler.

Expected Behavior

The project loads an embedded web page with a link. When the link is clicked a new window should appear containing a WebView2 instance that has:

• [Ignore when using `WebResourceRequested] 10 images in an iframe. The 5th and 10th image is displayed and contains the text "Must not be blocked", the other images are not loaded (blocked).
• 18 images at the bottom of the page. The first and last image is displayed and contains the text "Must not be blocked", the other images are not loaded (blocked).

Actual Behavior

• If Add event handlers is set to Before:
  • All images are shown, including the ones that should have been blocked. It seems that setting up the event handlers has no effect before setting CoreWebView2NewWindowRequestedEventArgs.NewWindow
• If Add event handlers is set to After:
  • Depending on the Delay setting, some or all of the images that should have been blocked are shown instead. There seems to be a race condition, because navigation is started right after CoreWebView2NewWindowRequestedEventArgs.NewWindow is set. As a result of navigation starting before assigning the event handlers, some requests do not have a chance to reach the event handlers and survive without blocking.

Requirements

This project requires:

1. .NET6 SDK
2. WebView2 canary version. To test you need to install Edge Canary.