I'm experimenting with creating Rack middleware gems. This lightweight gem servers as a replacement to Rack's CommonLogger statements. Improvements include colorized terminal output based on HTTP request method.

Rack::Transform is a middleware that attemps to make a compatibility layer between two different request/responses that should hit the same endpoint.

Proxy that translates strings

Rack middleware; truncates error body

The Recontributed Rack Middleware

Automatic port forwading via SSH tunneling.

Rack Middleware for validating twilio request signatures

Rack middleware to automatically include your Typekit JavaScript files

rack middleware to add u2f authentication to a rack app. Includes registration.

Rack middleware for inserting Google Universal Analytics and calling its API.

Check for unix domain socket usage

Integrate Unpoly with any Rack or Sinatra application

Rack middleware to uppercase your app's responses, built as an example/demo.

Middleware for signing urls

Rack middleware to modify Unicorn's procline to display request method, path and uuid during the request.

Rack Middleware for filtering by user agent

Urchin Tracking Module for rack application.

A rack middleware that searches for UTM tags in the request params, and stores them in cookies for later use.

provides a method for debugging like var_dump() of php.

rack-varnish-esi is a Varnish ESI middleware implementation for Rack which is as close as possible to Varnish's own ESI implementation. Note: This gem should only be used in development.