def redirection(url = nil)
      url ||= @uri.to_s

      return unless [301, 302].include?(NS::Browser.get(url).code)

      res = NS::Browser.get(url, followlocation: true)

      res.effective_url == url ? nil : res.effective_url
    end
def redirection(url = nil)
      url ||= @uri.to_s

      return unless [301, 302].include?(NS::Browser.get(url).code)

      res = NS::Browser.get(url, followlocation: true)

      res.effective_url == url ? nil : res.effective_url
    end
@param [ String ] url

 @return [ String ] The redirection url or nil

 As webmock does not support redirects mocking, coverage is ignored
 :nocov: