v0.0.2

src/routes/mod.rs

@@ -502,7 +502,15 @@ pub fn create_router(
     // Use the same base path for routing and authentication cookies.
     let router = match config.normalized_base_path() {
         "/" => inner,
-        base_path => Router::new().nest(base_path, inner),
+        base_path => {
+            // Axum nests an inner `/` route at the prefix itself (`/mail`),
+            // not at the trailing-slash variant (`/mail/`). Serve that variant
+            // explicitly so both URLs load the same embedded SPA.
+            let base_path_slash = format!("{}/", base_path.trim_end_matches('/'));
+            Router::new()
+                .route(&base_path_slash, get(crate::ui::serve_ui))
+                .nest(base_path, inner)
+        }
     };
 
     let router = router

src/routes/tests.rs

@@ -377,21 +377,19 @@ async fn base_path_serves_the_same_embedded_ui() {
         test_idle_manager(),
     );
 
-    let response = app
-        .oneshot(
-            Request::builder()
-                .uri("/mail/")
-                .body(Body::empty())
-                .unwrap(),
-        )
-        .await
-        .unwrap();
-    assert_eq!(response.status(), StatusCode::OK);
-    let body = response.into_body().collect().await.unwrap().to_bytes();
-    let html = String::from_utf8(body.to_vec()).unwrap();
-    assert!(html.contains("data-base-path=\"/mail\""));
-    assert!(html.contains("/mail/assets/app."));
-    assert!(html.contains(".js"));
+    for uri in ["/mail", "/mail/"] {
+        let response = app
+            .clone()
+            .oneshot(Request::builder().uri(uri).body(Body::empty()).unwrap())
+            .await
+            .unwrap();
+        assert_eq!(response.status(), StatusCode::OK, "{uri}");
+        let body = response.into_body().collect().await.unwrap().to_bytes();
+        let html = String::from_utf8(body.to_vec()).unwrap();
+        assert!(html.contains("data-base-path=\"/mail\""), "{uri}");
+        assert!(html.contains("/mail/assets/app."), "{uri}");
+        assert!(html.contains(".js"), "{uri}");
+    }
 }
 
 #[tokio::test]