redirect() in bottle.py in bottle 0.12.10 doesn't filter a "\r\n" sequence, which leads to a CRLF attack, as demonstrated by a redirect("233\r\nSet-Cookie: name=salt") call.
https://github.com/bottlepy/bottle/issues/913
https://github.com/bottlepy/bottle/commit/6d7e13da0f998820800ecb3fe9ccee4189aefb54