Quoting Kevin comment [here][1]:

> **/sites** basically snuck in when we
> froze 1.0. There are enough people
> using it that we can't track down (at
> least, not without alot of log parsing
> pain) that I didn't want to just tear
> it out. The correct way to use the 1.0
> API is to hit **/1.0/sites** directly, we
> make no guarantees about the lifetime
> of the raw /sites  route.

I used to call [/sites][2] without api version in my app; it is wrong.


  [1]: https://stackapps.com/questions/1726/stackauth-returning-404/1728#1728
  [2]: http://stackauth.com/1.0/sites