    # File lib/rack/handler.rb, line 46
        def self.default(options = {})
          # Guess.
          if ENV.include?("PHP_FCGI_CHILDREN")
            # We already speak FastCGI
            options.delete :File
            options.delete :Port

            Rack::Handler::FastCGI
          elsif ENV.include?(REQUEST_METHOD)
            Rack::Handler::CGI
          elsif ENV.include?("RACK_HANDLER")
            self.get(ENV["RACK_HANDLER"])
          else
            pick ['thin', 'puma', 'webrick']
          end
        end