If you need realtime update, then RSS is probably not the right tool. For polling, I currently do the following: * with `HTTP 304: not modified` result, I'll c

If you need realtime update, then RSS is probably not the right tool. For polling, I currently do the following: * with `HTTP 304: not modified` result, I'll come back in 60 minutes * if there is any update, I'll come back in 4 hours * if there is no cache control header, such as etag or last-modified, I will poll every 12 hours.