password_auth.rb

require 'java'

class Auth < java.net.Authenticator
  def getPasswordAuthentication
    if (requesting_host = "www.bbc.co.uk")
      return make_auth("libby","bunny")
    else
      return nil
    end
  end
  
  def make_auth(user, password)
    java.net.PasswordAuthentication.new(user, password.to_java.to_char_array)
  end
end

java.net.Authenticator.setDefault(Auth.new)