add 404 page

src/main.rs

@@ -141,6 +141,12 @@ async fn download(
     }
 }
 
+async fn not_found() -> Result<HttpResponse, Error> {
+    Ok(HttpResponse::NotFound()
+        .content_type("text/plain")
+        .body("not found"))
+}
+
 fn get_db_url() -> String {
     if let Ok(database_url) = env::var("DATABASE_URL") {
         return database_url;
@@ -239,6 +245,7 @@ async fn main() -> std::io::Result<()> {
                         .route(web::get().to(download)),
                 )
                 .service(Files::new("/static", "static").disable_content_disposition())
+                .default_service(web::route().to(not_found))
         }
     })
     .bind(bind_address)?