Nginx wont redirect to www - nginx

Question

Hello I have hard times to configure nginx properly. I would like redirect from https://example.com to https://www.example.com I found a lot of tutorials how to do it but not a single one worked with mine configuration files.
I used letsencrpyt to configure the SSL for me.
Here is the nginx conf file:
server {
server_name IP_ADDRESS example.com www.example.com;
location /static/ {
root /home/user/pyapps/ks_g;
}
location /media/ {
root /home/user/pyapps/ks_g;
}
location / {
include proxy_params;
proxy_pass http://unix:/run/gunicorn.sock;
}
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/www.example.com/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/www.example.com/privkey.pem; # managed by Certbot
include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}
server {
if ($host = www.example.com) {
return 301 https://$host$request_uri;
} # managed by Certbot
listen 80;
server_name IP_ADDRESS example.com www.example.com;
return 404; # managed by Certbot
}

Answer 1

Add redirect on condition to the server block with SSL or both:
if ($host != www.example.com) {
return 301 https://www.example.com$request_uri;
} # managed by Stack Overflow (sorry cannot hold myself)
This works as the following: if the Host HTTP header not equals www.example.com make permanent redirect to https://www.example.com$request_uri.