Use download client properly when fetching first byte

pkg/http/client.go

@@ -295,7 +295,8 @@ func (r *HTTPClient) CanFetchFirstByte(url string) bool {
 	}
 	req.Header.Set("Range", "bytes=0-0")
 	req = req.WithContext(ctx)
-	resp, err := r.client.Do(req)
+
+	resp, err := r.Do(req)
 	if err != nil {
 		return false
 	}