如何在很长一段时间内逐步向浏览器显示 HTML?
我是否需要传回任何 HTTP 标头以告诉浏览器我的服务器不会立即关闭连接并在收到 HTML 时显示?是否有必要让 HTML 像 flush() 那样增量显示?
Do I need to pass back any HTTP headers to tell the browser that my server won't be immediately closing the connection and to display as the HTML is received? Is there anything necessary to get the HTML to incrementally display like flush()?
这种技术曾经用于聊天之类的事情，但我正在考虑将其用于 COMET 类型的应用程序.
This technique used to be used for things like chat, but I'm thinking about using it for a COMET type application.
推荐答案
长轮询是一种常见的技术来做这样的事情；简单总结一下，它的工作原理如下:
Long polling is a common technique to do something like this; to briefly summarise, it works as follows:
客户端向服务器发送 XHR.
The client sends an XHR to the server.
- 如果有数据准备好，服务器会立即返回.
- 如果没有，服务器保持连接打开，直到数据可用，然后返回.
- 如果请求超时，请返回 1).
客户端上运行的页面接收到这些数据，并对其进行处理.
The page running on the client receives this data, and does what it does with it.
这就是 Facebook 实现其聊天功能的方式.
This is how Facebook implements its chat feature.
这篇文章也澄清了一些误解长轮询，并详细说明了这样做的一些好处.
This article also clears up some of the misconceptions of long-polling, and details some of the benefits of doing so.
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