as yuvadam said above, there's nothing special about this, though. you can do this to any site. for the site above, you can just go to *.withdjango.com.
My online portfolio is hello.my.name.is.[myname].me and I redirect all traffic that does not include this prefix to include it. It's a fun and neat little trick. This way if I give my url to someone I can give the short version and when they type it they are redirected to the longer url.
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[ 2.9 ms ] story [ 28.2 ms ] threadThis works with any domain that has *.example.com pointing to the right place.