gistfile1.rb

require 'rubygems'
require 'sinatra/base'
require 'hoptoad_notifier'
API_KEY = 'YOUR Hoptoad KEY here'


HoptoadNotifier.configure do |config|
  config.api_key = API_KEY
end

class MyApp < Sinatra::Base  # (was Sinatra::Default)
  use HoptoadNotifier::Rack
  enable :raise_errors

  get "/" do
    "Try raising an exception: <a href='/boom'>Boom</a>"
  end
  get "/boom" do
    raise "Sinatra has left the building"
  end
end

MyApp.run!