Christian Neukirchen is announcing that Rack with version number 1.6.4 is already available to download.

What is Rack ?

Rack is A modular Ruby web-server interface for developing web apps . Rack wraps HTTP requests and responses. By doing this, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.Rack is basically a common API for connecting web frameworks, web servers and layers of software inbetween. This is changelog for Rack version 1.6.4 :

• Fixed timing attack against Rack::Session::Cookie
• Fixed symlink path traversal in Rack::File
• Added various methods to Session for enhanced Rails compatibility
• Request#trusted_proxy? now only matches whole stirngs

You can read the complete changelog and also download this latest version on their homepage: rack.github.io