Using mechanize with proxy and basic auth

mechanize_with_proxy_and_basicauth.rb

require 'rubygems'
require 'mechanize'

agent = Mechanize.new
agent.set_proxy('proxy.example.com', 80, 'username', 'password')
agent.add_auth('http://hoge.com','b_username','b_password')
agent.user_agent_alias = "Windows Mozilla"

res = agent.get('http://hoge.com/some/page')
puts res.body