avoid redirect

[Mik J]

Hello,

I'd like to be able to offer let's encrypt in port 80 only and redirect everything else to port 443

server {
        listen 80;
        listen [::]:80;
        listen 443;
        listen [::]:443;
        server_name http://www.mydomain.org blog.mydomain.org;
        location ^~ /.well-known/acme-challenge { default_type "text/plain"; root /var/www/letsencrypt; }
        location = /.well-known/acme-challenge/ { return 404; }
        return 301 https:// mydomain.org;
}

My problem is that everything is redirected and I cannot access a file in /var/www/letsencrypt/.well-known/acme-challenge
When I comment the return 301 it works but I loose the redirection.
It seems to me that nginx parses everything where I would expect it to stop at
location ^~ /.well-known/acme-challenge { default_type "text/plain"; root /var/www/letsencrypt; }

Does anyone know the trick ?
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