require 'rubygems'
require 'rest-client'
require 'json'
require 'pp'

scheme="https"
hostname="yourdomain.com/api/v3"
username="myuser"
password="supersecure"

user="someuser"

response = RestClient.get("#{scheme}://#{username}:#{password}@#{hostname}/users/#{user}")

pp JSON.parse(response)