listen to https redirect to other page not working

[Christian Rocholl]

Hi guys,
 I am having a jpro.one parsed javafx webpage/app hosted by an nginx
server. It is accessible via http://DOMAIN:8080. This is working as
intended.

Now I have configured nginx so that it listens on port 80 and 443, so that,
http://DOMAINNAME -> return https://DOMAINNAME and https://DOMAINNAME ->
return http://localhost:8080, which I want to do.

When I enter http://DOMAINNAME:8080, the page works as intended.

When I enter https://DOMAINNAME:8080, I get a warning about a bad
certificate, since jpro returns http content, so I suppose it is working as
intended. Additional question: Is there a way to get rid of the cert
warning?

When I enter http://DOMAINNAME I get redirected to the https page, so
working as intended.

BUT: When I enter https://DOMAINNAME, it just says the page is not
available. I expected to get redirected to http://localhost:8080.

 My nginx config, checked with nginx -t, is syntax correct but fails to
redirect me on https access. These are my nginx config files in
/etc/nginx/conf.d/ I tried:

 - jpro.conf:
```
proxy_buffering off;
 proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_read_timeout 86400;
proxy_http_version 1.1;
 ```
and -DOMAIN.conf
```
 upstream ppcsc {
server localhost:8080;
}
 server {
listen 80;
server_name DOMAINNAME;
return 301 https://$http_host$request_uri;
}
 server {
listen 443 ssl;
server_name DOMAINNAME;
tcp_nodelay on;
ssl_certificate FILE.cer;
ssl_certificate_key FILE.key;
ssl_protocols TLSv1.3;
ssl_ciphers HIGH:!aNULL:!MD5;
# return 301 http://ppcsc;
return 301 http://$http_host:8080$request_uri;
# location / { # proxy_pass http://ppcsc; # } }
```
 Thanks for the help and kind regards , Chris
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