server {

        listen       443  ssl;

        server_name  itapiway.demo.com;

        ssl_certificate      cert/wsriakey-pem.crt;

        ssl_certificate_key  cert/wsriakey.key;

        ssl_session_cache    shared:SSL:1m;

        ssl_session_timeout  5m;

        ssl_ciphers 'ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS:!AES256';

        ssl_prefer_server_ciphers  on;

        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

        location / {

           proxy_set_header Host $http_host;

           proxy_set_header X-Real-IP $remote_addr;

           proxy_set_header X-Forwarded-For $remote_addr;

           client_body_buffer_size 10M;

           client_max_body_size 10G;

           proxy_buffers 1024 4k;

           proxy_connect_timeout 1s;

           proxy_next_upstream error timeout  http_502 http_504  non_idempotent;

           proxy_pass http://apigateway;

           real_ip_header     X-Forwarded-For;

           real_ip_recursive on;

        }

    }
参考资料
https://mozilla.github.io/server-side-tls/ssl-config-generator/