# File lib/faraday/adapter/em_http.rb, line 56
      def perform_single_request(env)
        req = EventMachine::HttpRequest.new(env[:url], connection_config(env))
        req.setup_request(env[:method], request_config(env)).callback { |client|
          save_response(env, client.response_header.status, client.response) do |resp_headers|
            client.response_header.each do |name, value|
              resp_headers[name.to_sym] = value
            end
          end
        }
      end