• read_buffer_size
• read_rnd_buffer_size
• sort_buffer_size
• join_buffer_size
• binlog_cache_size
• thread_stack
• tmp_table_size 

server {
    listen              443 ssl;

    # if you wanna to enable HTTP/2 (need nginx 1.9.5+)
    #listen              443 ssl http2;
    #listen              [::]:443 ssl http2;


    server_name         *.snippetinfo.net;
    ssl_certificate     /etc/httpd/conf/ssl/snippetinfo.net.crt;
    ssl_certificate_key /etc/httpd/conf/ssl/snippetinfo.net.key;
    ssl_protocols       TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers         HIGH:!aNULL:!MD5;
    location / {
        add_header X-Proxy-Cache    $upstream_cache_status;
        proxy_pass                  https://ssl_backend;
        proxy_set_header            Host $host;
        proxy_set_header            X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_cache_key             "$scheme$host$request_uri";
        proxy_cache                 STATIC;
        proxy_cache_valid           200  7d;
        proxy_cache_bypass  $http_cache_control;
        proxy_cache_use_stale       error timeout invalid_header updating
                                    http_500 http_502 http_503 http_504;

    }
    
}