=== Rainbows! 3.2.0 - trying to send files to slow clients / 2011-03-15 12:45 UTC

  We now use IO#trysendfile in the sendfile 1.1.0 to reduce the
  cost of generating backtraces for slow clients (from EAGAIN).
  Nothing new for people not serving static files (but more
  on the way).

  Existing "sendfile" gem users must upgrade to 1.1.0
  or risk being left without sendfile support at all:
   http://bogomips.org/rainbows.git/patch?id=cd8a874d