Github user hnakamur commented on the issue:
https://github.com/apache/trafficserver/pull/930
@mingzym Thanks for your comment.
I searched vary_on_user_agent in the trafficserver source code, but I
couldn't find it.
It turned out that proxy.config.cache.vary_on_user_agent was deleted at
version 5.3.0: [\[TS-3232\] Remove obsolete proxy.config.vary_on_user_agent
configuration - ASF JIRA](https://issues.apache.org/jira/browse/TS-3232)
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