ny others support the [Rack Specification]:

* [Camping](https://github.com/camping/camping)
* [Hanami](https://hanamirb.org/)
* [Padrino](https://padrinorb.com/)
* [Roda](https://github.com/jeremyevans/roda) **(Rack 3 Compatible)**
* [Ruby on Rails](https://rubyonrails.org/)
* [Sinatra](https://sinatrarb.com/)
* [Utopia](https://github.com/socketry/utopia) **(Rack 3 Compatible)**
* [WABuR](https://github.com/ohler55/wabur)

### Older (possibly unsupported) web frameworks

* [Ramaze](http://ramaze.net/)
* [Rum](https://github.com/leahneukirchen/rum)

## Available middleware shipped with Rack

Between the server and the framework, Rack can be customized to your
applications needs using middleware. Rack itself ships with the following
middleware:

* `Rack::CommonLogger` for creating Apache-style logfiles.
* `Rack::ConditionalGet` for returning [Not
  Modified](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/304)
  responses when the response has not changed.
* `Rack::Config` for modifying the environment before processing the request.
* `Rack::ContentLength` for setting a `content-len