This extension is part of the Sinatra::Contrib project. Run gem install sinatra-contrib to have it available. Sinatra::Streaming¶ ↑ Sinatra 1.3 introduced the stream helper. This addon improves the streaming API by making the stream object imitate an IO object, turning it into a real Deferrable and making the body play nicer with middleware unaware of streaming. IO-like behavior¶ ↑ This is useful