default.conf

server_names_hash_bucket_size  64;

server {
    listen   80; # listen for ipv4
    #listen   443 default_server; # listen for ipv4
    listen   [::]:80 default ipv6only=on; # listen for ipv6
    #listen   [::]:443 default ipv6only=on; # listen for ipv6

    server_tokens  off; # disable the Server nginx header 

    server_name _; # all hostnames

    # if it contains the www, remove it and redirect
    if ($host ~* ^www\.(.*)$) {       
        set $without_www $1;
        rewrite . https://$without_www$request_uri permanent;
    }

    return 301 https://www.$host$request_uri; # to https
}

server {
    listen 80;
    listen 443;
    server_name gmk-congress.com www.gmk-congress.com;
    return 301 https://www.geomechanics-congress.com;
}

server {
    listen 80;
    listen 443;
    server_name isrm2023.com www.isrm2023.com;
    return 301 https://www.isrm2023.info;
}