class Puma::Rack::Builder

This example includes a piece of middleware which will run before requests hit +Heartbeat+.

end
end
run Heartbeat
use Middleware
map '/' do
Rack::Builder.app do

The +use+ method can also be used here to specify middleware to run under a specific path:

end
end
run Heartbeat
map '/' do
Rack::Builder.app do

Creates a route within the application.

def map(path, &block)
  @map ||= {}
  @map[path] = block
end