try this (www.webservicex.net is not very reliable though):
#!ruby
require 'savon'
WSDL_URL = 'http://www.webservicex.net/uszip.asmx?wsdl'
client = Savon.client(wsdl: WSDL_URL,
log: true, # set true to switch on logging
log_level: :debug,
pretty_print_xml: true)
zip = ARGV[0] || "10004"
response = client.call(:get_info_by_zip, message: {"USZip"=>zip})
print response