[Haskell] Finding the length of a String in bytes

[David House]

Hi there.

I recently needed to add a Content-Length header to my HTTP request
forged with Network.HTTP [1]. However, this needs to be the length of
the body content in bytes, not characters. Without assuming the
characters will all be ASCII, is there an easy way of doing this?
length seems to have the correct results, but I'm uneasy about relying
on this.

Any comments?

-- 
-David House, dmhouse at gmail.com