Rainbows! 是一个为 Rack 应用而开发的 HTTP 服务器，基于 Unicorn 。主要为一些长时间请求和慢速的客户端而设计。
Changes: This release fixes corrupted large response bodies for Ruby 1.8 users with the WriterThreadSpawn and WriterThreadPool models introduced in 0.93.0. This bug did not affect Ruby... 1.9 users nor the users of any older concurrency models. There is also a strange new Rainbows::Sendfile middleware.