The file is httpd2.conf. These are the relevant bits:
... AuthType Digest AuthName darkness AuthDigestDomain http://sales.butterthlies.com AuthDigestFile /usr/www/APACHE3/ok_digest/digest_users
Run it with ./go
2. At the
client end, Microsoft Internet Explorer (MSIE) v5 displayed a
password screen decorated with a key and worked as you would expect;
Netscape v4.05 asked for a username and password in the usual way and
returned error 401 “Authorization
required.”