On iOS we don't use long-polling. On the web we use Websockets when possible, but fall back to long-polling if necessary. We only use HTTPS though for security reasons.
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Awesome. WebSockets is the perfect technology for this scenario. Do you find WebSockets traverses NATs and firewalls as the RFC promises or it has limitations?
With SSL it's quite reliable (without it's pretty bad). Fortunately we always use SSL...