Lighttpd2

"mod_progress.c" in the line 316 does a check against HTTP status code 200 only.

All HTTP codes in the form 2xx should indicate a success, as it's defined in the standard.

I find the 204 code to be particularly useful in a file upload, cause that makes browsers to not load a new page after the upload.

Please consider the trivial change of making a number between 200 and 299 to indicate success (or maybe only 4xx and 5xx to indicate error).