class Warden::Manager

def call(env) # :nodoc:

:nodoc:
:api: private
If this is downstream from another warden instance, don't do anything.
Invoke the application guarding for throw :warden. 
def call(env) # :nodoc:
  return @app.call(env) if env['warden'] && env['warden'].manager != self
  env['warden'] = Proxy.new(env, self)
  result = catch(:warden) do
    env['warden'].on_request
    @app.call(env)
  end
  result ||= {}
  case result
  when Array
    handle_chain_result(result.first, result, env)
  when Hash
    process_unauthenticated(env, result)
  when Rack::Response
    handle_chain_result(result.status, result, env)
  end
end