Steps to reproduce:
- Go to the "Contact Us" page at https://stackoverflow.com/contact
- Select "I need to merge user profiles"
- The autofilled profile URL may be
https://, in which case it will be throw a validation error on submission, like:
Error: "your profile link should be of the form
Obviously this also occurs if you manually paste a https link, which is overwhelmingly likely if you're security conscious or using the HTTPS Everywhere plugin.
I would hope it's just an overly aggressive validation pattern, since there's no functional difference I can tell between the 2 profile pages.