diff --git a/src/handlers/proxy.rs b/src/handlers/proxy.rs
index b1bd6dd..0958ee8 100644
--- a/src/handlers/proxy.rs
+++ b/src/handlers/proxy.rs
@@ -22,6 +22,7 @@ pub async fn proxy_handler(
     // парсим GET запрос
     let (base_filename, requested_width, extension) = parse_image_request(&normalized_path);
     let ext = extension.to_lowercase();
+    warn!("detected file extension: {}", ext);
     let filekey = format!("{}.{}", base_filename, &ext);
     let content_type = match ext.as_str() {
         "jpg" | "jpeg" => "image/jpeg",