Update caddy.rst - Add HTTP Response Code and Message

source/manual/how-tos/caddy.rst

@@ -111,6 +111,8 @@ Option                      Description
 **Auto HTTPS**              `On (default)` creates automatic Let's Encrypt certificates for all domains that don't have more specific options set, like custom certificates.
 **Trusted Proxies**         If Cloudflare or another CDN provider is used, create an `Access List` with the IP addresses of that CDN and add it here. Add the same Access List to the domain this CDN tries to reach.
 **Abort Connections**       This option, when enabled, aborts all connections to the domain that don't match any specified handler or access list. This setting doesn't affect Let's Encrypt's ability to issue certificates, ensuring secure connections regardless of the option's status. If unchecked, the domain remains accessible even without a matching handler, allowing for connectivity and certificate checks, even in the absence of a configured upstream destination. When using Access Lists, enabling this option is recommended to reject unauthorized connections outright. Without this option, unmatched IP addresses will encounter an empty page instead of an explicit rejection, though the Access Lists continue to function and restrict access.
+**HTTP Response Code**      Set a custom HTTP response code that should be returned to the requesting client when the access list doesn't match. Setting this will replace "Abort Connections", all clients will stay connected but will receive the response code. Generally, using "Abort Connections" is recommended, because it will actively disconnect clients without serving anything.
+**HTTP Response Message**   Set a custom HTTP response message in addition to the HTTP response code. 
 =========================== ================================