handle errors

proxy/caddy/Caddyfile

@@ -6,6 +6,15 @@
 	}
 }
 
+(error) {
+	root * /usr/share/caddy
+	rewrite * /error.html
+	templates
+	file_server {
+		status {err.status_code}
+	}
+}
+
 *.{$DOMAIN} {
 	tls {
 		dns netcup {
@@ -79,7 +88,23 @@
 
 	# Fallback for otherwise unhandled domains
 	handle {
-		respond 404
+		respond "404 Not Found" 404
+	}
+
+	# handle wrong url pathes
+	handle_errors 404 {
+		#respond "{err.status_code} {err.status_text}" {err.status_code}
+		import error
+	}
+
+	# handle errors of proxy backends are down
+	# handle_errors 502 {
+	# 	respond "503 Service Unavailable" 503
+	# }
+
+	# every other error
+	handle_errors {
+		import error
 	}
 }