Question concerning upstream backup servers

Victor Iggy lists at
Sun Aug 9 10:19:31 MSD 2009

How does nginx handle backup servers? For example..

upstream squids {
    server; # squid 1
    server; # squid 2
    server backup; # nginx
    server backup; # perlbal

if both squids fail, How will nginx balance? Will it round-robin both
backups? or will it try the first backup and then move to the next one
if the first backup failed?

Quite interested in this.
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