Handle 404 in Caddy

modules/nixos/matrix.nix

@@ -23,12 +23,14 @@
     ## Matrix federation
     virtualHosts = {
       "jankremer.de:8448" = {
-        extraConfig = ''
+        extraConfig = # caddyfile
+          ''
             reverse_proxy localhost:6167
           '';
       };
       "jankremer.de" = {
-        extraConfig = ''
+        extraConfig = # caddyfile
+          ''
             handle /_matrix/* {
               reverse_proxy localhost:6167
             }

modules/nixos/website.nix

@@ -4,7 +4,8 @@
   ];
 
   services.caddy.virtualHosts = {
-    "jankremer.de".extraConfig = ''
+    "jankremer.de".extraConfig = # caddyfile
+      ''
         handle {
           root * /var/www/jankremer.de
           file_server
@@ -18,10 +19,16 @@
             path *.html
           }
           header @html Cache-Control "no-cache"
+
+          handle_errors {
+            rewrite * /404.html
+            file_server
+          }
         }
       '';
 
-    "jankremer.eu".extraConfig = ''
+    "jankremer.eu".extraConfig = # caddyfile
+      ''
         redir https://jankremer.de{uri} permanent
       '';
   };