I have a vanity-url redirect as a rewrite rule in
.htaccess, including German Umlaut
ü (Umlaut in the path, no Umlaut-Domain with those double-dashes...):
Remarkably, it works for:
ueber-me, also lowercase
mydomain.com/über does work.
The only thing not working is übercase
mydomain.com/Über. Though I did verify the correctness of my URI-encodings with rishida...
%C3%9Cber? it should be.