If you're interested in implementing reliable long-polling as described in the article, you might check out Pushpin (http://pushpin.org http://pushpin.org). It'

If you're interested in implementing reliable long-polling as described in the article, you might check out Pushpin (http://pushpin.org http://pushpin.org). It's a proxy server that you put in front of your API backend and it makes this sort of thing really easy. Pushpin also supports WebSockets, but the long-polling capability is first class and not an afterthought.