Github user jpeach commented on the pull request:
https://github.com/apache/trafficserver/pull/121#issuecomment-56849830
There's no such thing as a fallback; it's probably confusing to think of it
in those terms. We index the certificate in order. In the case of name or
address collisions, first certificate into the index is the winner. At lookup
time, we search by SNI name, then by address. We always take the longs match,
so an explicit name mapping beats a wildcard, and an address:port mapping beats
an address mapping.
https://trafficserver.readthedocs.org/en/latest/reference/configuration/ssl_multicert.config.en.html#certificate-selection
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