return a 400 on / when meilisearch is running in production

meilisearch-http/src/lib.rs

@@ -63,6 +63,7 @@ pub fn create_app(
             .service(routes::load_css)
     } else {
         app
+            .service(routes::running)
     }
 }
 

meilisearch-http/src/routes/mod.rs

@@ -29,6 +29,7 @@ impl IndexUpdateResponse {
     }
 }
 
+/// Return the dashboard, should not be used in production. See [running]
 #[get("/")]
 pub async fn load_html() -> HttpResponse {
     HttpResponse::Ok()
@@ -36,6 +37,18 @@ pub async fn load_html() -> HttpResponse {
         .body(include_str!("../../public/interface.html").to_string())
 }
 
+/// Always return a 200 with:
+/// ```json
+/// {
+///     "status": "Meilisearch is running"
+/// }
+/// ```
+#[get("/")]
+pub async fn running() -> HttpResponse {
+    let payload = serde_json::json!({ "status": "MeiliSearch is running" }).to_string();
+    HttpResponse::Ok().body(payload)
+}
+
 #[get("/bulma.min.css")]
 pub async fn load_css() -> HttpResponse {
     HttpResponse::Ok()