Release Notes: IO#trysendfile in the sendfile 1.1.0 gem is now used to reduce the cost of generating backtraces for slow clients (from EAGAIN). There is nothing new for people not serving static files. Existing "sendfile" gem users must upgrade to 1.1.0 or risk being left without sendfile support at all.
Release Notes: This release fixes EventMachine support. There's nothing relevant for most users who do not use EventMachine.
Release Notes: This release adds hijacking support for Rack 1.5.x users. There is also a new -N/--no-default-middleware option, and a few corner-case bugfixes/cleanups.
Release Notes: This release fixes two EventMachine bugs.
Release Notes: This release adds a bugfix to allow stream(:keep_open) in Sinatra (and possibly other async.callback users) to work properly with EventMachine. There are no changes for non-EventMachine users.
Release Notes: This release adds one bugfix for users of Fiber-based concurrency options.