new finctions and fixes

src/app/mod.rs

@@ -46,9 +46,10 @@ pub fn router(
         }
     });
 
-    let asset_cache_control =
-        HeaderValue::from_str(&format!("public, max-age={asset_cache_max_age_seconds}"))
-            .expect("valid asset cache-control header");
+    let asset_cache_control = HeaderValue::from_str(&crate::cache::cache_control(
+        asset_cache_max_age_seconds,
+    ))
+    .expect("valid asset cache-control header");
 
     Router::new()
         .route("/", get(home))