# File lib/faraday/connection.rb, line 127
    def default_parallel_manager
      @default_parallel_manager ||= begin
        handler = @builder.handlers.detect do |h|
          h.klass.respond_to?(:supports_parallel?) and h.klass.supports_parallel?
        end

        if handler then handler.klass.setup_parallel_manager
        elsif block_given? then yield
        end
      end
    end