Github user mingzym commented on the issue:
https://github.com/apache/trafficserver/pull/930
great job!
from your test case, the alternates vary from User-Agent, there is a
dedicated config proxy.config.cache.vary_on_user_agent that will control
whether we should vary on different User-Agent headers, and I think the
cache.select_alternate may result in completely disable the alternate, so as
all the 'vary' and 'alts' config options. while vary_on_user_agent may help you
vary on AE header and the 'Vary' headers, but not UA. outline here just incase
you need it.
well done.
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