tweaks exponential backoff and http self-check in :dns
tweaks exponential backoff and http self-check in :dns

jfranklin9000/urbit,jfranklin9000/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,jfranklin9000/urbit,urbit/urbit,urbit/urbit,jfranklin9000/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,jfranklin9000/urbit,urbit/urbit,jfranklin9000/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,jfranklin9000/urbit