I guess I can not really say with certainty that I know some are taking it. (It's too soon to tell) However, Google does not return an error message and neither does Direct Hit. But the vast majority of them suggest that is is an invalid URL.
The situation here is that the client used a frameset for his entire site so that the browser would show the security lock, he established his frameset as https://mysite.com/index.asp
My only solution so far has been to build a few new sites for him on doorway domains and link to his primary domain from there.