Proxy Pass to the same domain but different endpoint using TLS - nginx

Question

I'm trying to add two endpoints in nginx.conf file. The main purpose is to be able to send a POST request to the first endpoint so i can log the body message to the console (stdout). The second endpoint is needed because i need to do a proxy_pass to another endpoint so i can send the body message to stdout (I'm following this tutorial https://matthias-kainer.de/blog/posts/logging-client-console-errors-with-nginx/).
The problem i'm facing is that the server name can be any, so i have the server_name directive as _. I have tried a lot of things but i always get some error: 502 - Bad Gateway or 400 - Bad Request or 400 - No required SSL certificate was sent.
My nginx.conf file (and my actual try) is this:
worker_processes 1;
error_log /dev/stdout warn;
events {
worker_connections 1024;
}
http {
resolver 127.0.0.11 valid=30s;
resolver_timeout 20s;
access_log stdout;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
log_format error_trace '$remote_addr - $remote_user $request_time $upstream_response_time '
'[$time_local] "$request" $status $body_bytes_sent "Client Error: $request_body" "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /dev/stdout main;
error_log /dev/stdout debug;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
default_type application/octet-stream;
gzip on;
gzip_http_version 1.1;
gzip_vary on;
gzip_comp_level 6;
gzip_proxied any;
gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/javascript text/x-js;
gzip_buffers 16 8k;
gzip_disable "MSIE [1-6].(?!.*SV1)";
server {
listen 60000 ssl http2 default_server;
root /var/www/html;
server_name _;
server_tokens off;
client_body_buffer_size 1k;
client_header_buffer_size 1k;
client_max_body_size 1k;
large_client_header_buffers 4 16k;
ssl_certificate /some/path/some-file.pem;
ssl_certificate_key /some/path/some-file-key.key;
ssl_trusted_certificate /some/path/some-certificate.pem;
ssl_session_cache shared:SSL:50m;
ssl_session_timeout 180m;
ssl_session_tickets off;
ssl_protocols TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:ECDHE-RSA-AES128-GCM-SHA256:AES256+EECDH:DHE-RSA-AES128-GCM-SHA256:AES256+EDH:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4";
ssl_stapling on;
ssl_stapling_verify on;
ssl_verify_client on;
ssl_verify_depth 10;
ssl_client_certificate /some/path/some-certificate.pem;
add_header Strict-Transport-Security "max-age=31536000" always;
add_header X-Frame-Options SAMEORIGIN;
add_header X-Content-Type-Options nosniff;
add_header X-XSS-Protection "1; mode=block";
location = / {
try_files $uri$args $uri$args/ /index.html;
}
location = /client_error_trace {
access_log /dev/stdout error_trace;
proxy_pass https://127.0.0.1:60000/client_error_trace_proxy;
proxy_redirect off;
proxy_set_header Host $host;
}
location = /client_error_trace_proxy {
access_log off;
return 200 'Error logged';
}
error_page 404 /;
}
}
With this file, im getting an error 400 - Bad Request - No required SSL certificate was sent. Any hint or help would be very appreciated >_<