I understand that .htaccess is not supported by GitHub Pages. Is there an alternative for password-protecting particular directories for websites hosted by GitHub Pages?
Although you can't use .htaccess or .conf, Github has instructions on how to use the Jekyll Redirect From plugin.
"Unfortunately, GitHub pages only supports static pages. There is no way to make it execute server-side code and thus it's impossible to protect your pages with any kind of authentication scheme. If you expand further on why you need to password-protect your pages, maybe I can help you find a workaround."
I'm using a 404.html to redirect users from old S9Y index.php to my new blog on Github Pages. Check this commit: https://github.com/lionello/lionello.github.io/commit/c175f6524a53e29aea1890c8a758afd0e8944852
来源：https://stackoverflow.com/questions/13446435/is-there-an-alternative-to-htaccess-for-github-pages