As we mentioned earlier, Cuba is built on top of Rack … but what is Rack?Rack deals with HTTP requests. It provides a minimal interface between web servers supporting Ruby and Ruby frameworks. WithoutRack, Cuba would have to implement its own handler for each web server.You didn’t notice yet but we already used Rack. We used
rackup
, one of the tools that comes with Rack, to run our
“Hello Cuba!”
application.To use
rackup
, you need to supply a config file (by convention it uses the
.ru
extension). This file connects the Rack interface with ourapplication through the
run
method. This method receives an object that returns a Rack response. In our case, that object is our Cubaapplication:
run(Cuba)rackupalso figures out which server you have available. When we executed
rackup config.ru, it fired up
WEBrick
, a web serverbuilt into Ruby by default.
$ rackup config.ru[2014-05-06 23:37:23] INFO WEBrick 1.3.1...
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