Options for fallbacks?

[hunterloftis]

For example, to set the polling frequency.

[majek]

There isn't anything like 'polling frequency'. Polling transports do a trick called "long polling", which means that the polling request hangs and waits for data (a single call can hang at most until a heartbeat - 25 seconds by default).

All other options are defined in the README.

[hunterloftis]

I'm talking about this specifically:

"Polling transport

SockJS supports few good-old polling protocols for ancient browsers (including IE7). Unfortunately these techniques are quite slow, but there is not much that can done about it.

Polling transports can also be used in situations where proxy on the client side doesn't support WebSockets nor http chunking - it is required for the streaming protocols."

[majek]

This still holds true. We'll do long polling using JSONP and it can hang for anything from 0 seconds (when data is already buffered and available on the server side immediately) to 25 seconds (when heartbeat will be fired and will force the polling request to be re-issued).