Nginx & Comet: Low Latency Server Push - igvita.com
Server push is the most efficient and low latency way to exchange data. If both the publisher and the receiver are publicly visible then a protocol such as PubSubHubbub or a simpler Webhook will do the job. However, if the receiver is hidden behind a firewall, a NAT, or is a web-browser which is designed to generated outbound requests, not handle incoming traffic, then the implementation gets harder. If you are adventurous, you could setup a ReverseHTTP server. If you are patient, you could wait for the WebSocket’s API in HTML5. And if you need an immediate solution, you could compromise: instead of a fully asynchronous push model, you could use Comet, also known as Reverse Ajax, HTTP Server Push, or HTTP Streaming.
