XMPP works over persistent connections.

XMPP工作在持久化连接之上。

youdao

The challenge with streaming AMF is that it uses HTTP 1.1 persistent connections which are implemented differently by the different browsers.

流式AMF的挑战在于它使用了HTTP 1.1的持续连接，而不同的浏览器对其的实现方式却不同。

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One reason for this improvement is that the ADC keeps persistent connections open to the Lotus Domino server and can more efficiently use these channels for subsequent requests.

这一提高的原因之一是ADC持续打开到Lotus Domino服务器的连接，并能更高效地使用这些通道来进行后续的请求。

youdao

Cable and DSL offer persistent Net connections, or always-on connections, removing squealing, temperamental modems from the picture completely.

CNN: Satellite access a mixed bag