Add HTTP error redirection to CADDY

Caddyfile

@@ -9,3 +9,10 @@ reverse_proxy @dynamic localhost:8000
 
 root * /opt/emacs-survey/public
 file_server
+
+handle_errors {
+	rewrite * /{err.status_code}
+	reverse_proxy https://http.cat {
+		header_up Host {upstream_hostport}
+	}
+}

setup.org

@@ -93,11 +93,23 @@ reverse_proxy @dynamic localhost:8000
 #+end_src
 
 We'll just pass all other requests to the public folder of the Emacs Survey.
+
 #+begin_src prog
 root * /opt/emacs-survey/public
 file_server
 #+end_src
 
+For HTTP errors we could re-use the Genie error pages ... or have some fun 🐱.
+
+#+begin_src prog
+handle_errors {
+	rewrite * /{err.status_code}
+	reverse_proxy https://http.cat {
+		header_up Host {upstream_hostport}
+	}
+}
+#+end_src
+
 Just this one file is all it takes to get Caddy set up to our liking 🙂.
 
 #+begin_src sh