add clone impl

src/config.rs

@@ -412,6 +412,18 @@ impl<T: Clone> Deref for Data<T> {
     }
 }
 
+impl<T: Clone> Clone for Data<T> {
+    fn clone(&self) -> Self {
+        Data { config: self.config.clone(), request_counter: self.request_counter.load(Ordering::Relaxed).into() }
+    }
+
+    fn clone_from(&mut self, source: &Self) {
+        let Data { config, request_counter } = self;
+        config.clone_from(&source.config);
+        *request_counter.get_mut() = source.request_counter.load(Ordering::Relaxed);
+    }
+}
+
 /// Middleware for HTTP handlers which provides access to [Data]
 #[derive(Clone)]
 pub struct FederationMiddleware<T: Clone>(pub(crate) FederationConfig<T>);