nginx SSL terminator for varnish

terminator.conf

server {
    listen       443 ssl;
    server_name  api.example.com;

    ssl_certificate      /etc/ssl/custom/api.example.com.crt;
    ssl_certificate_key  /etc/ssl/custom/api.example.com.key;

    ssl_session_cache shared:SSL:1m;
    ssl_session_timeout  5m;

    ssl_ciphers  HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers   on;

    gzip        on;

    access_log /var/log/nginx/access.log;
    error_log  /var/log/nginx/error.log;

    client_max_body_size 10M;

    location / {
        proxy_pass http://api.example.com:80;
        proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
        proxy_redirect off;
        #proxy_buffering off;
        proxy_buffer_size   128k;
        proxy_buffers   4 256k;
        proxy_busy_buffers_size   256k;
        proxy_set_header        Host            $host;
        proxy_set_header        X-Real-IP       $remote_addr;
        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
     }

#    location / {
#        root   /usr/share/nginx/html;
#        index  index.html index.htm;
#    }
}