Webroot / HTTP-01 validation is OK with redirects to HTTPS

[jepe]

Continuing the discussion from Webroot and https-only server impossible:

@schoen

The HTTP-01 validator is willing to follow redirects, including redirects to HTTPS. I think a number of people have continued to use webroot successfully on servers that perform a blanket redirect from the HTTP site to the HTTPS site.

This piece of info prevented me from doing ugly things (stopping redirects to HTTPS temporarily, restarting the server.. twice / cert), which I was ready to commit because of my stupid conclusions based on this good piece of info:

@schoen

... HTTP-01 is defined by the ACME standard to require HTTP on port 80 (never HTTPS on port 443) ...

that's why I thought it'd be good to clip the good news (from April 2017):
"The HTTP-01 validator is willing to follow redirects, including redirects to HTTPS"