rack/rack — pull request #674 by ujifgc (2014-04-09 06:18:14+00:00)
Title: add quiet mode of rack server, rackup --quiet

Rack server should be able to not log every request if `rackup` is run with `-q` or `--quiet` switch. This mode would be useful with applications that provide own logging features.

Ref: https://www.google.ru/search?q=disable+rack+commonlogger