Is there any WebKit-specific error handling for when something with the proxy configuration goes wrong? In the failure cases I've been able to test — e.g. failing authentication with the proxy server — WebKit surfaces it through the navigation delegate's didFailProvisionalNavigation callback as a generic: "Could not connect to the server." — NSURLErrorCannotConnectToHost (code -1004) Since that's indistinguishable from an ordinary connectivity failure, is there any way to tell proxy/relay failures apart from normal browsing errors? I would want to be able to surface a distinct "proxy unavailable" state to the user rather than a generic connection error.

Right, if we could ensure that when you configured the proxy on the existing store and reloaded the current webview you would be connected to the proxy then we would not need to swap the data store at all.

I guess I am hoping to understand if it is strange or an anti pattern to build a new store every time you turn your proxy on/off. Up until now we have always used the default provided store for every webview: WKWebsiteDataStore.default.

This is a duplicate of https://developer.apple.com/forums/thread/830125. Please ignore in favor of https://developer.apple.com/forums/thread/830125

We figured it out. It is because our app is a browser app. Apps that have the com.apple.developer.web-browser managed entitlement may not claim to respond to Universal Links for specific domains. The system will ignore any such claims. Apps with the entitlement can still open Universal Links to other apps as usual. From https://developer.apple.com/documentation/xcode/preparing-your-app-to-be-the-default-browser It would be great to link this information in the Universal Link debugging so that it is an easy check for folks! I had to dig through the logs to determine it could be an issue with the fact that this was a browser app.

Update: Based on the documentation in Debugging Universal Links I updated the associated domains to use the wildcard instead of blog.mozilla.org but it still is not working. It is now: applinks:*.mozilla.org