Blocking HTTP 1.0?

[BryanPhelps-BigLeapWeb]

One of my clients believes someone is trying to hack their site.  We are seeing the requests with a server protocol or HTTP 1.0 so they want to block 1.0 entirely.

Will this cause any problems with search engines or regular, non-spamming visitors?

[AlanMosley]

i would think that most bots and modern browser all ise http 1.1 by now, but I am sure there are some things out there that still use 1.0. i seem to remember that some phones use 1.0, old windows media players
i would try to block them anothr way just to be sure. maybe rogerbot users 1.0
it sems a bit over kill
They may just change to 1.1