How do I use the -FF option?
I used the -S eu1.ethpool.org:3333 and -FF
http://127.0.0.1:8080, it does not work.
failover is only for getwork protocol, not stratum. So you can combine -F with -FF, but not -S with -FF.
The feature was built for a donator who wanted to use two stratum proxies, so if the proxy crashes, you can still continue on the other.
I'll add -SF (stratum failover) in a future release.