code: def [](url)
        # normalize the url
        url = URI(url)
  
        key = [url.scheme, url.host, url.port]
        paths = @credentials[key]
  
        return nil unless paths
  
        # longest path first
        ordered_paths = paths.keys.sort_by { |path_key| -path_key.length }
  
        # directories of the path
        path_dirs = URI.expand_path(url.path).split('/')
  
        ordered_paths.each do |path|
          return paths[path] if path_dirs[0,path.length] == path
        end
  
        return nil
      end
docs: Creates a new auth store.
  
   @since 0.2.2
  
  
   Given a URL, return the most specific matching auth credential.
  
   @param [URI] url
     A fully qualified url including optional path.
  
   @return [AuthCredential, nil]
     Closest matching {AuthCredential} values for the URL,
     or `nil` if nothing matches.
  
   @since 0.2.2