fix Caddyfile

Caddyfile

@@ -9,20 +9,28 @@
     }
 }
 
-https://steamcommunity.com, https://www.steamcommunity.com, https://cdn.steamcommunity.com, https://store.steampowered.com, https://api.steampowered.com {
+(sign) {
     tls {
         issuer internal {
             # more than 1 year may cause some problems
             lifetime 360d
         }
         # on_demand
     }
+}
+
+(rev) {
+    lb_policy round_robin
+    transport http {
+        tls
+        tls_insecure_skip_verify
+    }
+}
+
+https://steamcommunity.com, https://www.steamcommunity.com, https://cdn.steamcommunity.com, https://store.steampowered.com, https://api.steampowered.com {
+    import sign
     reverse_proxy * https://s.team https://steamuserimages-a.akamaihd.net https://steamstore-a.akamaihd.net https://steamcommunity-a.akamaihd.net https://steampipe.akamaized.net https://eaassets-a.akamaihd.net {
-        lb_policy random
-        transport http {
-            tls
-            tls_insecure_skip_verify
-        }
+        import rev
         fail_duration 10s
         health_timeout 30s
     }