(define-sxml-page (regexp "/assets/.+/THUMBNAIL")
 (lambda (path)
  (let* ((paths (string-split path "/"))
         (asset_id (second paths))
         )
    (let-values (((filename mime_type) (SELECT filename, mime_type from table where asset_id = @asset_id AND type=thumbnail)))
     (awful-response-headers '((content-type ,mime_type))))
      (flush-headers)
     (sendfile (current-response-port) (contents-of filename))
)
  )))