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 369 def call(env) @for.context(env, @app) end
# File lib/rack/utils.rb, line 377 def context(env, app=@app) recontext(app).call(env) end
# File lib/rack/utils.rb, line 373 def recontext(app) self.class.new(@for, app) end
# File lib/rack/utils.rb, line 364 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