Flickr's username problems

I feel like I'm missing something. Say I have a URL for someone's Flickr profile (e.g. https://www.flickr.com/people/hawx-/), and I want to retrieve the info for that user using the API, what method should I call?

flickr.people.getInfo will get the data I want, but it needs the NSID of the person. Now you can have URLs like https://www.flickr.com/people/75695140@N04, which is my profile again, but it is much nicer to refer to them using the "nice URL".

I can get the NSID using flickr.people.findByUsername, but this wants the username which may not be the same as the thing in the URL. In my case I have "hawx-" in the URL, but my username is "hawx~".