Example for Windows platform
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1. In httpd.conf, ensure directory to be protected has the following directive
eg.
<Directory "D:/apache/htdocs">
AllowOverride AuthConfig
...
</Directory>
2. Create a user password file (preferably at a location not under the web
server's document root.
eg.
D:\APACHE\BIN\htpasswd -c D:\APACHE\USERS\PASSWD arahman
new password: *******
retype new password: *******
3. Create a .htaccess file at the directory to be password protected
eg. D:\apache\htdocs\.htaccess
AuthName "Restricted site"
AuthType Basic
AuthUserFile d:\apache\users\passwd
require valid-user
4. Restart the apache web server