Without check-reuse-pool, it is impossible to perform check on server
using @rhttp protocol. This is due to the inherent nature of the
protocol which does not implement an active connect method.
Thus, ensure that check-reuse-pool is always set when a reverse HTTP
server is declared. This reduces server configuration and should prevent
any omission. Note that it is still require to add "check" server
keyword so activate server checks.
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