mechanize：Mechanize::File#uri

everyday Ruby 
>> require 'mechanize'
=> true
>> agent = Mechanize.new
=> #<Mechanize:0xb743b234 ...
>> agent.get('http://www.google.co.jp/intl/en_com/images/srpr/logo1w.png').class
=> Mechanize::File
>> agent.get('http://www.google.co.jp/intl/en_com/images/srpr/logo1w.png').uri
=> #<URI::HTTP:0xb7430a00 URL:http://www.google.co.jp/intl/en_com/images/srpr/logo1w.png>