Handle 404 in Caddy

modules/nixos/website.nix

@@ -4,26 +4,33 @@
   ];
 
   services.caddy.virtualHosts = {
-    "jankremer.de".extraConfig = ''
-      handle {
-        root * /var/www/jankremer.de
-        file_server
+    "jankremer.de".extraConfig = # caddyfile
+      ''
+        handle {
+          root * /var/www/jankremer.de
+          file_server
 
-        @static {
-          path *.css *.js *.woff2 *.woff *.ttf *.png *.jpg *.jpeg *.svg *.ico *.webp
+          @static {
+            path *.css *.js *.woff2 *.woff *.ttf *.png *.jpg *.jpeg *.svg *.ico *.webp
+          }
+          header @static Cache-Control "public, max-age=31536000, immutable"
+
+          @html {
+            path *.html
+          }
+          header @html Cache-Control "no-cache"
+
+          handle_errors {
+            rewrite * /404.html
+            file_server
+          }
         }
-        header @static Cache-Control "public, max-age=31536000, immutable"
+      '';
 
-        @html {
-          path *.html
-        }
-        header @html Cache-Control "no-cache"
-      }
-    '';
-
-    "jankremer.eu".extraConfig = ''
-      redir https://jankremer.de{uri} permanent
-    '';
+    "jankremer.eu".extraConfig = # caddyfile
+      ''
+        redir https://jankremer.de{uri} permanent
+      '';
   };
 
   networking.firewall.allowedTCPPorts = [