与Web服务器的持久连接（如Web上的AJAX）-PersistentConnectiontoWebServer(LikeAJAXonWeb)

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In terms of push notifications, if the http server does not close the close the connection the the NSURLConnection will stay open, and you will keep getting data. Note that if you are designing something like that you must use the asynchronous NSURLConnection methods, as a synchronous connection will not end until the server closes the connection.

在推送通知方面,如果http服务器没有关闭关闭连接,NSURLConnection将保持打开状态,并且您将继续获取数据。请注意,如果您正在设计类似的东西,则必须使用异步NSURLConnection方法,因为在服务器关闭连接之前,同步连接不会结束。

As for sending more data, it is really not designed to do that. If you want to push more data in a single http request after you have sent it (which seems like a pretty bad idea to me) you are going to have to roll your http stack of find some opensource component you can use.

至于发送更多数据,它实际上并不是为此而设计的。如果你想在发送它之后在一个http请求中推送更多数据(这对我来说似乎是一个非常糟糕的主意),你将不得不滚动你的http堆栈找到一些你可以使用的开源组件。

Note that NSURLConnection will use keep alive and other things as it deems appropriate, so if you start multiple logical connections to the same host in your app they may end up on the wire using the same keep alive connection, etc.

请注意,NSURLConnection将使用keep alive和其他认为合适的内容,因此如果您启动多个逻辑连接到应用程序中的同一主机,它们可能会使用相同的保持连接等结束。