After seeing HTTP, then HTTPS, I was half-expecting the URL for that one to be eu://httpbin.org/
It was hosted in an EU-based datacenter on Heroku (to reduce latencies, not for any specific privacy reasons), but I need to check to see if we are still hosting it there.
Ah, okay. Because of the way it is listed I thought it was some protocol extension or other HTTP-related speciality, not a different location. Thanks for clearing that up.