# File lib/rack/commonlogger.rb, line 16
16:     def call(env)
17:       began_at = Time.now
18:       status, header, body = @app.call(env)
19:       header = Utils::HeaderHash.new(header)
20:       log(env, status, header, began_at)
21:       [status, header, body]
22:     end