# File lib/faraday/adapter/rack.rb, line 30
      def call(env)
        super
        rack_env = {
          :method => env[:method],
          :input  => env[:body].respond_to?(:read) ? env[:body].read : env[:body]
        }

        env[:request_headers].each do |name, value|
          name = name.upcase.tr('-', '_')
          name = "HTTP_#{name}" unless SPECIAL_HEADERS.include? name
          rack_env[name] = value
        end if env[:request_headers]

        timeout  = env[:request][:timeout] || env[:request][:open_timeout]
        response = if timeout
          Timer.timeout(timeout, Faraday::Error::TimeoutError) { execute_request(env, rack_env) }
        else
          execute_request(env, rack_env)
        end

        save_response(env, response.status, response.body, response.headers)
        @app.call env
      end