401 unauthed with Net::Http

nethttptest.rb

require 'net/http'

uri = URI('https://students.foster.washington.edu/undergrad/_vti_bin/usergroup.asmx?WSDL')

req = Net::HTTP::Get.new(uri)
req.basic_auth 'USERNAME', 'PASSWORD'

res = Net::HTTP.start(uri.hostname, uri.port,
  :use_ssl => uri.scheme == 'https') {|http|
  http.request(req)
}

# Status
puts res.code       # => '200'
puts res.message    # => 'OK'
puts res.class.name # => 'HTTPOK'

# Body
puts res.body