Is HTTP/1.0 still in use?

Question

Say one is to write an HTTP server/client, how important is it to support HTTP/1.0? Is it still used anywhere nowdays?

Edit: I\'m less concerned wit

Answer 1

Looking into this myself for other purposes:

"HTTP/1.0 is in use by proxies, some mobile clients, and IE when configured to use a proxy. So 1.0 appears to still account for a non- trivial % of traffic on the web overall. ... Yes, there are many 1.0 clients still out there."

Source (July 2009): http://groups.google.com/group/erlang-programming/msg/08f6b72d5156ef74

:-(

Update (March 2011):

If you are going to build a client/server thingy, make the client use HTTP/1.1, and make the server accept both 1.1 and 1.0. Doing web-development, it is a PITA to get clients trying to load a page without the Host header, because I have no way to know which site I am supposed to load :-S So you better don't build a client like that ;-)