Trying to get Apache to talk HTTPS apparently you need a SSL cert. Followed this : OpenSUSE Leap Apache and SSL
# sudo /usr/bin/gensslcert comment mod_ssl server certificate
C XY
ST unknown
L unknown
U web server
O SUSE Linux Web Server
CN localhost
email webmaster@localhost
srvdays 730
CAdays 2190

creating CA key...
2048 semi-random bytes loaded
Generating RSA private key, 2048 bit long modulus
..............+++
....+++
e is 65537 (0x010001)

creating CA request/certificate ...
/etc/apache2/ssl.crt/localhost-ca.crt -> /srv/www/htdocs/LOCALHOST-CA.crt

creating server key...
¦ 2048 semi-random bytes loaded
Generating RSA private key, 2048 bit long modulus
.+++
..............................+++
e is 65537 (0x010001)

creating server request ...
creating server certificate ...
Signature ok
subject=C = XY, ST = unknown, L = unknown, O = SUSE Linux Web Server, OU = web server, CN = localhost, emailAddress = webmaster@localhost
Getting CA Private Key

Verify: matching certificate & key modulus

Verify: matching certificate signature
/etc/apache2/ssl.crt/localhost-server.crt: OK

generating dhparams and appending it to the server certificate file...
Generating DH parameters, 2048 bit long safe prime, generator 2
This is going to take a long time
......................++++..............+....+.+..
....+++...........................................
.....................++++......+..+.+.+..+........
..

# sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/ssl/private/apache-selfsigned.key -out /etc/ssl/certs/apache-selfsigned.crt

[sudo] password for root:
Generating a 2048 bit RSA private key
...............+++
...................+++
writing new private key to '/etc/ssl/private/apache-selfsigned.key'
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:SE
State or Province Name (full name) [Some-State]:Skelleftea
Locality Name (eg, city) []:Skelleftea
Organization Name (eg, company) [Internet Widgits Pty Ltd]:smurfd Inc
Organizational Unit Name (eg, section) []:Smurfin for real
Common Name (e.g. server FQDN or YOUR name) []:smurfd.serveblog.net
Email Address []:some@mail.com
# sudo openssl dhparam -out /etc/ssl/certs/dhparam.pem 2048
[sudo] password for root:
Generating DH parameters, 2048 bit long safe prime, generator 2
This is going to take a long time
.............................

# sudo cp /etc/ssl/private/apache-selfsigned.key /etc/apache2/ssl.key/server.key
# sudo cp /etc/ssl/certs/apache-selfsigned.crt /etc/apache2/ssl.crt/server.crt

# sudo a2enflag SSL