404. That’s an error.

The requested URL /bookmarks/mark?op=add&bkmk=http%3A%2F%2Fwww.dipteristsforum.org.uk%2Fwiki%2Fglossary%3As%3Ascale%3Fidx%3Dglossary%253At&title=glossary:s:scale1 was not found on this server. That’s all we know.