API request retries now detect stale connections (ECONNRESET/EPIPE) and automatically disable HTTP keep-alive for the retry attempt. This is controlled by the tengu_disable_keepalive_on_econnreset feature flag and prevents repeated failures on dead TCP connections.
Evidence
Stale connection handling (search for "Stale connection (ECONNRESET/EPIPE)")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.