# \[ANN\] unicorn 5.5.4 - Rack HTTP server for fast clients and \*nix **URL:** https://rubytalk.org/t/ann-unicorn-5-5-4-rack-http-server-for-fast-clients-and-nix/75219 **Category:** ruby-talk **Created:** [24 March 2020 22:17 UTC](https://rubytalk.org/t/ann-unicorn-5-5-4-rack-http-server-for-fast-clients-and-nix/75219 "2020-03-24T22:17:09Z") **Posts on this page:** 1 **Page:** 1
### Author: ![Eric\_Wong](https://avatars.discourse-cdn.com/v4/letter/e/a3d4f5/32.png) [@Eric\_Wong](https://rubytalk.org/u/Eric_Wong) #### Post date: [24 March 2020 22:17 UTC](https://rubytalk.org/t/ann-unicorn-5-5-4-rack-http-server-for-fast-clients-and-nix/75219/1 "2020-03-24T22:17:09Z")
unicorn is an HTTP server for Rack applications designed to only serve fast clients on low-latency, high-bandwidth connections and take advantage of features in Unix/Unix-like kernels. Slow clients should only be served by placing a reverse proxy capable of fully buffering both the the request and response in between unicorn and slow clients. Disclaimer: Due to its ability to tolerate crashes and isolate clients, unicorn is unfortunately known to prolong the existence of bugs in applications and libraries which run on top of it. Consider this just an announcement to inform existing users of a new version, not something to convince you to switch to something that set the entire Ruby world back decades in terms of concurrency. .onion URLs below are available for Tor users and can reduce our operating costs: \* [https://yhbt.net/unicorn/](https://yhbt.net/unicorn/)   [http://unicorn.ou63pmih66umazou.onion/](http://unicorn.ou63pmih66umazou.onion/) \* public list: [unicorn-public@yhbt.net](mailto:unicorn-public@yhbt.net) \* mail archives: [https://yhbt.net/unicorn-public/](https://yhbt.net/unicorn-public/)   [http://ou63pmih66umazou.onion/unicorn-public/](http://ou63pmih66umazou.onion/unicorn-public/) \* git clone [https://yhbt.net/unicorn.git](https://yhbt.net/unicorn.git)   torsocks git clone [http://ou63pmih66umazou.onion/unicorn.git](http://ou63pmih66umazou.onion/unicorn.git) \* [https://yhbt.net/unicorn/NEWS.atom.xml](https://yhbt.net/unicorn/NEWS.atom.xml)   [http://unicorn.ou63pmih66umazou.onion/NEWS.atom.xml](http://unicorn.ou63pmih66umazou.onion/NEWS.atom.xml) \* nntp://news.public-inbox.org/inbox.comp.lang.ruby.unicorn   nntp://ou63pmih66umazou.onion/inbox.comp.lang.ruby.unicorn Changes:     One change to improve RFC 7230 conformance in the HTTP parser:     [https://yhbt.net/unicorn-public/20200319022823.32472-1-bofh@yhbt.net/](https://yhbt.net/unicorn-public/20200319022823.32472-1-bofh@yhbt.net/)