default vs base.rb

# Classical top-style apps and Sinatra::Default has a bunch of useful
# default settings not found in Sinatra::Base:
#
# - Exceptions are mapped to the error handler of your Sinatra app
#   instead of propagating to Rack
#
# - The Rack::MethodOverride middleware is enabled, allowing the
#   '_method=PUT' hack
#
# - Static files are served from the public directory
#
# - Logging is enabled
# 
# .. and then some. Take a look at the source yourself:

  class Default < Base
    set :raise_errors, Proc.new { test? }
    set :dump_errors, true
    set :sessions, false
    set :logging, Proc.new { ! test? }
    set :methodoverride, true
    set :static, true
    set :run, Proc.new { ! test? }

    ..
  end

# Refer to http://www.sinatrarb.com/configuration.html for documenation
# for the different options.