NGINX reverse proxy HTTP to HTTPS server issue - nginx-reverse-proxy

Question

I'm facing issue with reverse proxy configured using nginx
The curl is showing that the request is reaching the endpoint and this last send the response and it stuck on nginx.
About to connect() to 127.0.0.1 port 80 (#0)
Trying 127.0.0.1...
Connected to 127.0.0.1 (127.0.0.1) port 80 (#0)
POST / HTTP/1.1
User-Agent: curl/7.29.0
Host: 127.0.0.1
Accept: /
Content-Type: text/xml
SOAPAction: http://tempuri.org/AOI
Content-Length: 1707
Expect: 100-continue
< HTTP/1.1 100 Continue
^C
[root#venom conf.d]#
Below my configuration
server {
listen 80 ;
server_name 80_proxy;
access_log /var/log/nginx/access.log main;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
client_header_buffer_size 1k;
client_body_buffer_size 16k;
large_client_header_buffers 4 8k;
server_tokens off;
error_page 497 https://$host:$server_port$request_uri;
root html;
index index.html index.htm;
proxy_redirect http:// $scheme://;
proxy_set_header Host $host:$server_port;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_hide_header X-Powered-By;
proxy_cookie_path / "/; secure; SameSite=Lax; Max-Age=172800";
chunked_transfer_encoding on;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_request_buffering off;
client_body_timeout 5;
proxy_connect_timeout 90;
proxy_buffering off;
add_header Strict-Transport-Security 'max-age=31536000; includeSubDomains; always';
add_header Content-Security-Policy "script-src 'self';";
location / {
proxy_send_timeout 2100;
proxy_read_timeout 2100;
client_max_body_size 10M;
proxy_ssl_certificate /etc/ssl/cert.crt;
proxy_ssl_certificate_key /etc/ssl/cert.key;
proxy_ssl_trusted_certificate /etc/ssl/cert_ca.crt;
proxy_ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
proxy_ssl_ciphers HIGH:!aNULL:!MD5;
proxy_ssl_verify on;
proxy_ssl_verify_depth 2;
proxy_pass https://10.34.22.33:801;
}
}
Thanks in advance