Introducing the Rack-Rscript gem
Example
First of all install rack-rscript and then create a file called hello_world2.ru containing the following:
require 'rack-rscript'
run RackRscript.new({pkg_src: 'http://rorbuilder.info/r'})
The file is executed using rackup e.g. rackup hello_world2.ru -p 3000
Observation
When navigating to the address http://127.0.0.1:3000/do/utility/time in your web browser you should observe the date and time is returned from the request.