foo.ru

# foo.ru
require 'sinatra/base'

class ErrorTest
  def initialize(app)
  end

  def call(env)
    raise "test!"
  end
end

class Server < Sinatra::Base
  enable :dump_errors

  # If this is commented out, and the page http://localhost:9292 is loaded,
  # then the standard exception page is shown and the backtrace is logged to
  # the terminal.
  #
  # However, if the error is raised in the middleware (that is, this line is
  # uncommented), then the error page is shown but the stack trace is not
  # shown.
  #use ErrorTest

  get '/' do
    raise "test2"
  end
end

run Server