Rack (web server interface)

Rack is a modular interface between web servers and web applications developed in the Ruby programming language. With Rack, application programming interfaces (APIs) for web frameworks and middleware are wrapped into a single method call handling HTTP requests and responses.

Rack, a Ruby Webserver Interface
Original author(s)Leah Neukirchen
Developer(s)James Tucker, Josh Peek, José Valim, Michael Fellinger, Aaron Patterson, Santiago Pastorino, Konstantin Haase
Stable release
3.0.2 / December 5, 2022 (2022-12-05)
Repository
Operating systemCross-platform
TypeMiddleware
LicenseMIT License
Websiterack.github.io 

Rack is used by many Ruby web frameworks and libraries, such as Ruby on Rails and Sinatra. It is available as a Ruby Gem. Many Ruby applications are called "rack-compliant".

Rack has inspired similar frameworks in JavaScript (jack.js), Clojure, Perl (Plack), Common Lisp (Clack), and .NET (OWIN).

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