Certificates loaded with "crt" and "crt-list" commonly share the same
intermediate certificate in PEM file. "issuers-chain-path" is a global
directive to share intermediate chain certificates in a directory. If
certificates chain is not included in certificate PEM file, haproxy
will complete chain if issuer match the first certificate of the chain
stored via "issuers-chain-path" directive. Such chains will be shared
in memory.
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