Where it comes from?
Code:
[Wed Jun 1 15:17:50 2016] [info] Listening at "http://*:3000".
Server available at http://127.0.0.1:3000.
[Wed Jun 1 15:17:53 2016] [debug] GET "/echo".
[Wed Jun 1 15:17:53 2016] [debug] Routing to a callback.
[Wed Jun 1 15:17:53 2016] [debug] 101 Switching Protocols (0.000943s, 1060.445/s).
[Wed Jun 1 15:18:00 2016] [debug] GET "/echo".
[Wed Jun 1 15:18:00 2016] [debug] Routing to a callback.
[Wed Jun 1 15:18:00 2016] [debug] 101 Switching Protocols (0.000422s, 2369.668/s).
[Wed Jun 1 15:21:14 2016] [debug] GET "/echo".
[Wed Jun 1 15:21:14 2016] [debug] Routing to a callback.
[Wed Jun 1 15:21:14 2016] [debug] 101 Switching Protocols (0.000476s, 2100.840/s).
[Wed Jun 1 15:21:44 2016] [debug] GET "/echo".
[Wed Jun 1 15:21:44 2016] [debug] Routing to a callback.
[Wed Jun 1 15:21:44 2016] [debug] 101 Switching Protocols (0.000482s, 2074.689/s).
[Wed Jun 1 15:21:49 2016] [debug] GET "/echo".
[Wed Jun 1 15:21:49 2016] [debug] Routing to a callback.
[Wed Jun 1 15:21:49 2016] [debug] 101 Switching Protocols (0.000474s, 2109.705/s).
[Thu Jun 2 09:45:00 2016] [debug] GET "/echo".
[Thu Jun 2 09:45:00 2016] [debug] Routing to a callback.
[Thu Jun 2 09:45:00 2016] [debug] 101 Switching Protocols (0.000486s, 2057.613/s).