title: RACSignal catch to itself?
body: <p>I have an array of objects that represent some servers. All of them should answer to a certain web request. I need to query one of them (any one of them) and return a RACSignal for that, but if it fails I need to go to the next one in the list. Is it ok if I make a signal that gets one of them from the array tries to make the request , and if this fails catches to itself to try with another one from that list? </p>