nginx 强制 https 浏览器总是提醒重定向过多不能正常访问网页

有两个网站用这个配置，但另外一个好的，这个就提示重定向过多，帮忙看一下，配置如下：

server{
listen 443 ssl;
server_name zhidao.xxxx.com;
index index.html index.htm index.php default.html default.htm default.php;
root /mnt/xxxx/zhidao;

ssl_certificate /mnt/xxxx/zhidao/zhidao.chained.crt;
ssl_certificate_key /mnt/xxxx/zhidao/zhidao.ikanfan.com.key;
ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_session_cache shared:SSL:10m;

include zhidao.conf;
#error_page 404 /404.html;
location ~ [^/]\.php(/|$)
{
# comment try_files $uri =404; to enable pathinfo
try_files $uri =404;
fastcgi_pass unix:/tmp/php-cgi.sock;
fastcgi_index index.php;
include fastcgi.conf;
#include pathinfo.conf;
}

location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$
{
expires 30d;
}

location ~ .*\.(js|css)?$
{
expires 12h;
}

access_log off;
}
server
{
listen 80;
server_name zhidao.xxxx.com;
location /.well-known/ {
add_header Content-Type 'text/plain;';
root /mnt/xxxx/zhidao;
}
location / {
return 301 https://zhidao.xxxx.com$request_uri;
}
}