exists? (ActiveResource::Base)

    # File lib/active_resource/base.rb, line 537
          def exists?(id, options = {})
            if id
              prefix_options, query_options = split_options(options[:params])
              path = element_path(id, prefix_options, query_options)
              response = connection.head(path, headers)
              response.code == 200
            end
            # id && !find_single(id, options).nil?
          rescue ActiveResource::ResourceNotFound
            false
          end