Rack provides a minimal, modular, and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in the
simplest way possible, it unifies and distills the API for web servers, web
frameworks, and software in between (the so-called middleware) into a
single method call.
The exact details of this are described in the Rack specification, which all Rack applications should conform to.
Rack alternatives and similar gems
Based on the "Web Servers" category
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