Log response time at Heroku
heroku, ruby-on-rails
Solution
Are you aware that Heroku already logs your response time? In your terminal do `heroku logs -t --app your-app-name` and you'll see `service=xxxms` which is the number of miliseconds each request takes.
Problem
Heroku adds a HTTP header called X-Request-Start. Its a unix timestamp. I have a Rails 3.2 application at Heroku and want to log response time for HTTP requests. Whats the latest point of possible integration in Rails to do: ``` start = Time.at(env['HTTP_X_REQUEST_START'].to_f / 1000.0).utc response_time = Time.now.utc - start ``` I'm thinking of implementing a Rack middleware to calculate the response time.