https://1.0.0.1. works though, so the question is why a final period works for traditionally formatted IPv4 addresses (uint8.uint8.uint8.uint8), but not those formatted as a plain old uint32. If I wasn't jetlagged and a tad drunk I'd dig into it a bit.

I do wonder if there's a typo in the URL that OP intended, because the title is "https://16777217/" whereas the URL is "https://16777217." and . and / are only a key away from each other (at least on my IE/UK ISO layout).