fix: specify request type in route handler for clarity (#8623)

Author: hubertshelley

rust/silent/src/main.rs

@@ -9,7 +9,8 @@ async fn main() {
     let route = Route::new("").get(index).append(
         Route::new("user")
             .append(
-                Route::new("<id>").get(|req| async move { req.get_path_params::<String>("id") }),
+                Route::new("<id>")
+                    .get(|req: Request| async move { req.get_path_params::<String>("id") }),
             )
             .post(index),
     );