Set the process name to what request is currently being processed. If you're lucky and your OS shows process name changes, you'll see something like:
15696 ttys001 0:07.04 script/rails S GET http://localhost:3000/servers/localhost/edit
The letter before the request method means:
In Rails, just add to your Gemfile:
the gem will include itself as middleware.
If in Sinatra or using config.ru:
require 'rack-process-name' use Rack::ProcessName