nginx 配置 https 不成功呢？

server {
        listen       80;
        #listen       [::]:4000 default_server;
        server_name  www.xxx.com xxx.com;
        #root         /usr/share/nginx/html;
        #root         /home/kkfor/koa-blog/admin/dist;
        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;
        #rewrite ^(.*) https://$host$1 permanent;
        ssl on;
        ssl_certificate 1_xxx.com_bundle.crt;
        ssl_certificate_key 2_xxx.com.key;
        ssl_session_timeout 5m;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2; #按照这个协议配置
        ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:HIGH:!aNULL:!MD5:!RC4:!DHE;#按照>这个套件配置
        ssl_prefer_server_ciphers on;
        location / {
            proxy_pass          http://127.0.0.1:3000;
            proxy_set_header    Host $host;
            proxy_set_header    X-Real-IP $remote_addr;
            proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
            #proxy_set_header    X-Forwarded-Proto  $scheme;
            #proxy_redirect      off;
            #proxy_http_version  1.1;
            #proxy_set_header    Upgrade     $http_upgrade;
            #proxy_set_header    Connection  $connection_upgrade;
            try_files $uri $uri/ /index.html last;
            index index.html;
        }