I haven’t used this feature, but others do. Many programs allow you to create resource locators for items that that program knows about. These locators start with a string that gives the protocol (like http, nntp, ftp, etc), then a colon, and then either one or two slashes, followed by a string that describes the resource.
The wonky issue is whether the resource locator should have zero, one or two slashes. I direct you to this discussion:
for more. It indicates that Scrivener and Sente disagree on the structure of these links, and perhaps this is a problem with Scrivener. As I said, I don’t use this feature this way.