How to point http to https subdomain in NGINX? - spring

Question

I am working on a Spring Boot app that servers content for 3 types of users. All three users "live" in the same application. I want to configure NGINX to 1) redirect all http to https and 2) redirect traffic as follows:
http to https://www.example.com
http://b2b.example.com to https://b2b.example.com/b2b (Ideally not showing the "/b2b". Here all the b2b spring boot endpoints are listening)
So far this is my NGINX conf:
server {
listen 80 default_server;
listen [::]:80 default_server;
return 301 https://$host$request_uri;
}
server {
listen 443;
server_name example.com www.example.com;
ssl on;
ssl_certificate ...;
ssl_certificate_key ...;
ssl_session_cache shared:SSL:10m;
access_log ...;
error_log ...;
location / {
proxy_pass http://localhost:5050;
proxy_set_header Host $host;
# re-write redirects to http as to https, example: /home
proxy_redirect http:// https://;
}
}
server {
listen 443;
server_name b2b.example.com;
ssl on;
ssl_certificate ...;
ssl_certificate_key ...;
ssl_session_cache shared:SSL:10m;
access_log ...;
error_log ...;
location / {
proxy_pass http://localhost:5050/b2b;
proxy_set_header Host $host;
# re-write redirects to http as to https, example: /home
proxy_redirect http:// https://;
}
}
On Sring Boot side, all B2B endpoints are listening to a pattern starting with "B2B". So for example the login page for these users is .../B2B/login. Right now if I go to b2b.example.com I get redirected to b2b.example.com/B2B/login. What I want is the browser to show "B2B.example.com/login" and to display the "/B2B/login" page. All the B2B sites omitting the "/B2B" part in the URL.