The Nginx document said that there are two upstream-related directives
introduced in the version of 1.15.3: "keepalive_requests" and
"keepalive_timeout". But the directive "keepalive" has already been
instroduced in the version of 1.1.4. So I want to know how does Nginx handle
the keepalive connections for upstream before the version 1.15.3 was released.
When will the keepalive connections for upstream be closed?
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