试着添加了HTTPS的支持

在StartSSL上面申请了免费的SSL证书，StartCom Class 1 Primary Intermediate Server CA
Nginx配置中最初是在一个Server中监听80添加了443，结果https链接正常访问，http访问出现Error 400

400 Bad Request
The plain HTTP request was sent to HTTPS port

后面再网上搜索加尝试最终找到解决办法，分开配置server，分别对应443和80，80端口的设置跳转到https，问题解决。

......前面省略
server {
#listen 80 default_server;
#listen [::]:80 default_server ipv6only=on;
listen 443;
root /xxx;
index index.php index.html index.htm;
server_name zhao.im;
ssl on;
ssl_certificate    /xxx/xxx.crt;
ssl_certificate_key     /xxx/xxx.key;
ssl_session_timeout 5m;
ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers "HIGH:!aNULL:!MD5 or HIGH:!aNULL:!MD5:!3DES";
ssl_prefer_server_ciphers on;
error_page 497 "https://$host$uri?$args";
......后面省略
}
#------------------------------
server {
listen 80;
server_name zhao.im;
rewrite ^/(.*) https://$server_name$1 permanent;
}