Recently i searched for a quick solution to store some information and found ErfurtWiki. It is very simple, small and easy to embed. So i used it.
After some experimenting i got it to work for me. There was just one thing that annoyed me: When on https, it produces "bad request" after a page is edited.
I located the problem on line 972 of ewiki.php: the url for the redirect is built from some components including the server PORT, but not the protocol. So ewiki generated a URL with port 443 and method http. It can easily be fixed by replacing line 972 ($url= ...) with the following:
if($_SERVER['HTTPS']) $protocol = "https://";
else $protocol = "http://";
$url = $protocol.$_SERVER["SERVER_NAME"]. $port . $url;
Other than that, ErfurtWiki is really cool. And extremely fast.