nginx proxy_pass requests to fqdn without converting to IP - nginx

Question

I am trying to proxy_pass requests using nginx to a public fqdn.
The server has LB configured only to respond to requests when accessed using fqdn and get an ssl hand shake error when accessed using IP.
My issue is that the nginx is implicitly converting the fqdn to set of IPs and trying them one by one and failing.
Is there a way have nginx proxy_pass without converting the fqdn to IP and route the request to upstream at fqdn?
location /public/api {
proxy_pass https://public.server.com/api;
proxy_set_header Host $host;
}
2022/04/24 23:10:20 [error] 912419#912419: *5 peer closed connection in SSL handshake (104: Connection reset by peer) while SSL handshaking to upstream, client: xxxxxxxx, server: _, request: "POST /<api> HTTP/1.1", upstream: "https://<ip1>:443/<api>", host: "<ip>"
2022/04/24 23:10:20 [error] 912419#912419: *5 peer closed connection in SSL handshake (104: Connection reset by peer) while SSL handshaking to upstream, client: xxxxxxxx, server: _, request: "POST /<api> HTTP/1.1", upstream: "https://<ip2>43/<api>", host: "<ip>"
2022/04/24 23:10:20 [error] 912419#912419: *5 peer closed connection in SSL handshake (104: Connection reset by peer) while SSL handshaking to upstream, client: xxxxxxxx, server: _, request: "POST /<api> HTTP/1.1", upstream: "https://<ip3>:443/<api>", host: "<ip>"

Answer 1

Add client certificate and private key to verify nginx and each back-end server. Using proxy_ssl_certificate and proxy_ssl_certificate_key instruction:
location /public/api {
proxy_pass https://public.server.com/api;
proxy_set_header Host $host;
   proxy_ssl_certificate     /etc/nginx/client.pem;  
   proxy_ssl_certificate_key /etc/nginx/client.key  
}