# File lib/rack/utils.rb, line 130 def initialize app_f, app_r raise 'running context not provided' unless app_f raise 'running context does not respond to #context' unless app_f.respond_to? :context raise 'application context not provided' unless app_r raise 'application context does not respond to #call' unless app_r.respond_to? :call @for = app_f @app = app_r end