title: Heroku router log parameter description
body: <p>Heroku router log has 10 parameters and descriptions are in <strong><a href="https://devcenter.heroku.com/articles/http-routing#heroku-router-log-format" rel="nofollow noreferrer">https://devcenter.heroku.com/articles/http-routing#heroku-router-log-format</a></strong>. 
  one of the parameter is service.It described like <strong>amount of time in milliseconds spent proxying data between the backend web process and the client</strong>.
  Is service time is response time of the request or what it is? Could anyone explain?</p>