Ah thanks.. it feels like that's almost the wrong way round though; that if it doesn't get a rapid TCP connection establishment then it should try another addr

Ah thanks.. it feels like that's almost the wrong way round though; that if it doesn't get a rapid TCP connection establishment then it should try another address. I guess an issue is that the client sends the first data in the HTTP protocol, so you don't get a full health indication until after you've issued your request, at which point you have to worry about idempotency etc.