Keeping heroku dyno alive

ping.rake

# $ heroku addons:add scheduler:standard
# $ heroku addons:open scheduler

require "net/http"

desc "Ping app"
task :ping do
  url = 'my-app.herokuapp.com'

  puts "ping? (#{url})"
  r = Net::HTTP.new(url, 80).request_head('/')
  puts "pong! (#{r.code} #{r.message})"
end