diff --git a/src/handlers/proxy.rs b/src/handlers/proxy.rs
index 0958ee8..75012ca 100644
--- a/src/handlers/proxy.rs
+++ b/src/handlers/proxy.rs
@@ -21,9 +21,11 @@ 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);
+    warn!("detected file extension: {}", extension);
+    let ext = extension.as_str().to_lowercase();
+    warn!("normalized to lowercase: {}", ext);
     let filekey = format!("{}.{}", base_filename, &ext);
+    warn!("filekey: {}", filekey);
     let content_type = match ext.as_str() {
         "jpg" | "jpeg" => "image/jpeg",
         "png" => "image/png",