服务器推送技术（又名“COMET”、“http 服务器推送”、“websockets”）
MS/Azure 在服务器推送技术方面提供什么？我的猜测是，目前还没有针对此的 RTM 产品。我认为该技术面向 Microsoft 的状态如下：
- WCF：提供 TCP 双工，但需要两个 TCP 套接字（其中一个在客户端上打开）。因此，这不是 COMET（并且无法通过防火墙工作）
- WebSockets：可从 Microsoft 的 Html 5 Labs 获得，但是 ASP.NET仍处于开发阶段
- ：有一个“MS 代码示例”提供“反向 ajax"。看起来很新。这是最接近 MS 推荐的方法吗？
我还看到了有关“工作者角色通信”的 Azure 讨论，但这并不符合条件，因为它需要“80 和 443 以外的端口”。
那么这仍然是一个“等等看”的话题，还是我遗漏了什么？
What does MS/Azure offer in the way of server push technology? My guess is that there is not, as yet, an RTM offering for this. The Microsoft-oriented status of this technology, I believe is as follows:
- WCF: offers TCP duplexing, but requires two TCP sockets (where one is opened on the client). Ergo this is not COMET (and won't work through firewalls)
- WebSockets: Available from Microsoft's Html 5 Labs, but still very much under development
- ASP.NET: There is a "MS code samples" offering of "reverse ajax". It looks very new. Is this the closest thing to a MS recommended approach?
I also see an Azure discussion of "Worker Role Communication", but that does not qualify since it requires ports "other than 80 and 443."
So is this still a "wait and see" topic, or is there something I'm missing?
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看看WebSync；它不是来自微软本身，而是基于微软技术的comet解决方案。
（免责声明：我在冰山工作）。
Take a look at WebSync; it's not from Microsoft itself, but it's a solution for comet based on Microsoft technology.
(Disclaimer: I work @ Frozen Mountain).
微软目前正在研究它，你可以从这里下载原型：
http://html5labs.interoperabilitybridges.com/prototypes/websockets/websockets/info
编辑：
抱歉，刚刚看到您实际上已经看到了。话虽如此，没有理由不尝试原型，它可能比许多“生产”就绪的 OSS 项目更完整；）
Microsoft are currently working on it, you can download a prototype from here:
http://html5labs.interoperabilitybridges.com/prototypes/websockets/websockets/info
EDIT:
Sorry just saw you've actually seen that already. Having said that, there's no reason to not try the prototype, heck it's probably more complete than a lot of "production" ready OSS projects ;)