diff --git a/src/proxy/mod.rs b/src/proxy/mod.rs
index 82c5cbd..7e19f06 100644
--- a/src/proxy/mod.rs
+++ b/src/proxy/mod.rs
@@ -65,6 +65,7 @@ impl UserPassAuthCredential {
     }
 }
 
+#[allow(clippy::mutable_key_type)]
 #[derive(Debug, Serialize)]
 pub struct ProxyServer {
     pub addr: SocketAddr,
diff --git a/src/web/rich.rs b/src/web/rich.rs
index e0b8e8d..57b7249 100644
--- a/src/web/rich.rs
+++ b/src/web/rich.rs
@@ -27,7 +27,7 @@ impl ResourceBundle {
         file.read_to_end(&mut content)
             .expect("error on read moproxy-web bundle");
 
-        let name_ext = name.rsplitn(2, '.').next();
+        let name_ext = name.rsplit_once('.').map(|x| x.1);
         let mime = match name_ext {
             Some("html") => "text/html",
             Some("js") => "application/javascript",