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5d021c028e
In 3.2, a new server keyword "check-reuse-pool" has been introduced. It allows to reuse a connection for a new check, instead of always initializing a new one. This is only performed if the check does not rely on specific connection parameters differing from the server. This patch further restricts reuse for checks only when an HTTP ruleset is used at the backend level. Indeed, reusing a connection outside of HTTP is an undefined behavior. The impact of this bug is unknown and depends on the proxy/server configuration. In the case of an HTTP backend with non-HTTP checks, check-reuse-pool would probably cause a drop in reuse rate. Along this change, implement a new diagnostic warning on servers to report that check-reuse-pool cannot apply due to an incompatible check type. This must be backported up to 3.2.
