If your acme certificate is declared in a crt-store, and the certificate
file does not exist on the disk, HAProxy will start with a temporary key
pair.
This is an experimental feature which needs the
"expose-experimental-directives" keyword in the global section.
+ When using the "acme" keyword in a crt-store, it is possible to start without
+ an existing certificate on the disk. Instead, a temporary key pair will be
+ used until the ACME certificate is generated. This behavior is exclusives to
+ crt-stores, neither a crt-list line nor an ssl-f-use line can achieve the
+ same without declaring a crt-store first.
+
See also Section 12.8 ("ACME") and "domains" in this section.
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