Curiosity in my production.log: */*

In my production.log, I usually see lines like this:

Processing by HomeController#index as HTML

But sometimes I see the line like this:

Processing by HomeController#index as */*

At first I thought perhaps those calls were made by a bot, but after looking at it closer it looks as those they are generated by normal users. I have no idea, first, how that line could have been generated, and second, is it anything to worry about. The correct route seems to be taken, so it appears to be harmless, but I'd love to understand what is going on.

I suspect this is IE sending weird Accept headers:

http://blogs.msdn.com/b/ieinternals/archive/2009/07/01/9811694.aspx

but you may want to try checking the server logs to make sure.

--Matt Jones