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Create a Let's Encrypt certificate before your DNS change

                location /.well-known/acme-challenge/ {
  proxy_set_header Host $host;
  proxy_pass http://yourdomain.c.section.io;
}
            
                <Location "/.well-known/acme-challenge/">
ProxyPreserveHost On
ProxyPass "http://yourdomain.c.section.io"
</Location>
`