class Appium::Driver

def server_url
  return @custom_url if @custom_url
  if !@sauce_username.nil? && !@sauce_access_key.nil?
    "http://#{@sauce_username}:#{@sauce_access_key}@ondemand.saucelabs.com:80/wd/hub"
  else
    "http://127.0.0.1:#{@port}/wd/hub"
  end
end