AuthUserFile /full/path/to/.passwdfile
AuthGroupFile /dev/null
AuthName "Realm Name"
AuthType Basic
require valid-user

Put this in an .htaccess file to protect the directory it is in and anything below it. This requires that a file named .passwdfile exists in the directory \\\"/full/path/to/\\\" and contains at least one username/password combination.\\r\\n\\r\\nUse this snippet to generate the .passwdfile\\r\\n\\r\\n[Use this snippet to generate the .passwdfile](http://snipplr.com/view/38523/htpasswd-basic-authentication--create-userpass-with-encrypted-password/ \\\"htpasswd\\\")

.htaccess Basic Authentication

htaccess

Apache