Context allows the use of a compatible middleware at different points in a request handling stack. A compatible middleware must define context which should take the arguments env and app. The first of which would be the request environment. The second of which would be the rack application that the request would be forwarded to.
# File lib/rack/utils.rb, line 308 def initialize(app_f, app_r) raise 'running context does not respond to #context' unless app_f.respond_to? :context @for, @app = app_f, app_r end
# File lib/rack/utils.rb, line 313 def call(env) @for.context(env, @app) end
# File lib/rack/utils.rb, line 321 def context(env, app=@app) recontext(app).call(env) end
# File lib/rack/utils.rb, line 317 def recontext(app) self.class.new(@for, app) end