By default, cassettes are static: the exact response that was received when the cassette was recorded will be replayed for all future requests. Usually, this is fine, but in some cases you need something more dynamic. You can use ERB for this.
To enable ERB evaluation of a cassette, pass the :erb => true option to a cassette. If you want to pass variables to the cassette, you can pass the names and values of the variables in a hash (:erb => { ... }).
Enable dynamic ERB cassette evalutation using :erb => true
Given a previously recorded cassette file "cassettes/dynamic.yml" with: