Waitress fails to match unicode `url_prefix`

[jkmnt]

If url_prefix contains character outside of ascii, it fails to match request path.

The code at

waitress/src/waitress/task.py

Line 527 in b590603

if path.startswith(url_prefix_with_trailing_slash):

compares url_prefix with path as is. The path here is 'utf8-as-latin1' string, while url_prefix is just the unicode string as is.

I think url_prefix should be converted at init time, i.e.

adj.url_prefix = url_prefix.encode("utf-8").decode("iso-8859-1")

and then reported in SCRIPT_NAME in this converted format. If I understand WSGI spec correctly, SCRIPT_NAME encoding should be the same as the PATH_INFO.