URL Schemes not working on macOS

Question

I'm working on an app that needs to get an authorization token from an external provider. So, I need a custom URL scheme for the redirection callback.

The redirection callback is: chirper://success.

I registered the URL Scheme in my Info.plist:

I also added the following method in my AppDelegate.swift:

func handleGetURLEvent(event: NSAppleEventDescriptor?, replyEvent: NSAppleEventDescriptor?) {
    if let aeEventDescriptor = event?.paramDescriptor(forKeyword: AEKeyword(keyDirectObject)) {
        if let urlStr = aeEventDescriptor.stringValue {
            let url = URL(string: urlStr)
            print(url)
            // do something with the URL
        }
    }
}

But when I open the redirection callback URL with Safari, this is what I get:

Safari can't open this URL because macOS doesn't recognize URLs that start with chirper:

Answer 1

Try to "Clean Build Folder" and rebuild. Did help for me. Looks like this is required in some cases.

Answer 2

According to the answer to this question, the problem is the inclusion of :// in the callback URL. If you remove those, the URL should be opened. I found this was correct on macOS 10.15.5.