Github user vmamidi commented on the issue:
https://github.com/apache/trafficserver/pull/1404
According to RFC ( https://tools.ietf.org/html/rfc7231#section-4.2.1 ) all
the idempotent methods should be retryable but we can at least try to retry the
safe requests. The methods GET, HEAD, OPTIONS, and TRACE are considered safe.
ATS does not retry any requests based on the connection state with Origin
Server and bytes sent to Origin Server. ATS should retry all the safe requests
to give a chance to serve the request instead of responding with 502.
Also, we can make this configurable so that ATS can handle special
scenarios.
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