cubicweb #2583913 the login form tells users to go to http://... if they don't have an account [done]

this should only be done if the https-deny-anonymous option is set, otherwise it makes no sense.

prioritynormal
typebug
done in3.16.1
load0.100
load left0.000
closed by#e362054d9701 [login] don't redirect to http url if we allow anonymous on https