Comet是如何实现的？
我想知道如果请求的连接还没有完成，客户端如何得到响应？
原理是什么？
事实上，我已经阅读了很多关于这个主题的帖子：
How do I Implement basic“Long Polling” "?
但都没有解决我的疑问
I wander how do client side get response if the connection of request is not finished yet?
What's the principle?
In fact I've read quite a few posts on this subject:
How do I implement basic "Long Polling"?
How does the live, real-time typing work in Google Wave?
But none of them solve my doubt
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答案取决于所使用的技术。
使用“隐藏 Iframe”技术的 HTTP 流可以做到这一点。该技术是服务器将
The answer depends on the technique used.
HTTP streaming, using the "hidden Iframe" technique, can do this. The technique is that the server sends
<script>elements to the hidden iframe. Each script element will contain some executable JavaScript. This technique relies on the fact that browsers generally interpret an HTML element as soon as it is loaded. In this way, there is no need for any sort of polling code in the client; the script tags will contain the appropriate function calls, and the browser will execute those calls as soon as the script element is completely loaded.