Seems like nginx proxy server doen't work - nginx

Question

I'm newbie in linux and nginx hosting. I have a simple asp net core app that I need to run on https://localhost:5050. So I send a request on https://localhost and wait that nginx process it to :5050 port. But it doesn't..
I created \etc\nginx\sites-available\aspnetcore.conf with the following code
server {
listen 443;
location / {
proxy_pass https://localhost:5050;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection keep-alive;
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
}
}
and a symbolinc link to /etc/nginx/sites-enabled/aspnetcore.conf.
Also I have in Startup.cs file
app.UseForwardedHeaders(new ForwardedHeadersOptions
{
ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto
});
So my app doesn't get any request. What am I doing wrong?
UPD:
The problem in https contact. I configured ssl as it describes here
https://www.digitalocean.com/community/tutorials/how-to-create-a-self-signed-ssl-certificate-for-nginx-on-debian-9
But still there are no requests...

Answer 1

upstream backend {
server localhost:5050;
}
server {
listen 443;
location / {
proxy_pass http://backend;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection keep-alive;
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
}
}