问题 I'm playing with EM to achieve streaming and concurrency. I had a problem with streaming... I run the following rack app https://gist.github.com/1394840 using $ rackup -s thin -p 3000 async_app.ru While testing with $ ab -c 10 -n 20 http://localhost:3000/ , the app seemed accepting parellel requests. Great! I expect it to achieve streaming meanwhile. When I test it in Firefox8, it works so well. And using $ curl -i http://localhost:3000/ , the result is streamed just as expected too! But