diff --git a/racket-webview.rkt b/racket-webview.rkt
index 35cc892..8c293fd 100644
--- a/racket-webview.rkt
+++ b/racket-webview.rkt
@@ -259,8 +259,10 @@
                         (string->symbol
                          (string-downcase
                           (substring (bytes->string/utf-8 ext-bytes) 1)))))
+               (exists? (file-exists? file-to-serve))
                )
-          (if (file-exists? file-to-serve)
+          (dbg-webview "file to serve: ~a, ext: ~a, file-exists?: ~a" file-to-serve ext exists?)
+          (if exists?
               (response/output
                #:mime-type (string->bytes/utf-8 (mimetype-for-ext ext))
                #:headers (list (make-sec-header sec-cache))