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Not sure if the url form works, but it works adding the Basic Auth header when accessing a UI page, just like an API endpoint.
What is it that you're trying to do? Depending on your use case, I wonder if using OAuth from your other site would make sense.
I'm working with a client looking to put in place an interim approach to login users from an existing portal (where they are already authenticated). The question was just if they could just dynamically create a URL based on the current user's details, since Basic Auth was supported by the API in the header.