ssl_certificate_by_lua_block {
      auto_ssl:ssl_certificate()
}

    # You must still define a static ssl_certificate file for nginx to start.
    #
    # You may generate a self-signed fallback with:
    #
    # openssl req -new -newkey rsa:2048 -days 3650 -nodes -x509 \
    #   -subj '/CN=sni-support-required-for-valid-ssl' \
    #   -keyout /etc/ssl/resty-auto-ssl-fallback.key \
    #   -out /etc/ssl/resty-auto-ssl-fallback.crt
ssl_certificate /etc/ssl/resty-auto-ssl-fallback.crt;
ssl_certificate_key /etc/ssl/resty-auto-ssl-fallback.key;
ssl_protocols TLSv1.2 TLSv1.3;
add_header Strict-Transport-Security "max-age=31536000" always;