Github user asfgit closed the pull request at:
https://github.com/apache/trafficserver/pull/338
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GitHub user syucream opened a pull request:
https://github.com/apache/trafficserver/pull/338
TS-3998: Disable h2c upgrades
https://issues.apache.org/jira/browse/TS-3998
Reject h2c token for now. after applying this patch, h2c upgrading is
handled as Invalid Upgrade Request.