如果我直接访问https，它可以工作，但该站点仍然可以通过HTTP访问。如何将所有http强制转换为https？

我用过WordPress HTTPS plugin. 但它不会重定向到https。

我已使用以下配置nginx：

server {

    listen       xxx.x.xxx.xxx:80;
    listen       127.0.0.1:80;

    server_name mydomain.com;


    root   /var/www/html/mydomian.com/;
    index  index.html index.htm index.php;
    charset utf-8;



    location / {
            try_files $uri $uri/ /index.php?$args;
    rewrite ^(.*)$ https://$http_host$request_uri redirect;
  }
   ...

但这种重定向将导致无限循环。我安装了CloudFlare Flexible SSL, 这表示可以解决无限循环，但仍然没有帮助。

有没有其他方法可以强制http重定向到https？

UPDATE

我的ssl块：

   server {

       listen       xxx.x.xxx.xxx:443 ssl;
       listen       xxx.x.x.x:443 ssl;

    server_name  $hostname xxx.x.xxx.xxx;


    ssl                    on;
    ssl_certificate         /etc/nginx/ssl.crt/server.crt.combined;
    ssl_certificate_key     /etc/nginx/ssl.key/server.key;

    root   /var/www/html;
    index  index.html index.htm index.php;


    location ~^/~(?<userdir_user>.+?)(?<userdir_uri>/.*)?$ {
            alias /home/$userdir_user/private_html$userdir_uri;
            index index.html index.htm index.php;
            autoindex on;

            location ~ \\.php$ {
                fastcgi_split_path_info ^(.+\\.php)(/.+)$;
                include /etc/nginx/fastcgi_params;
                fastcgi_index index.php;

                #try_files does not work after alias directive
                if (!-f $request_filename) {
                    return 404;
                }

                fastcgi_param DOCUMENT_ROOT /home/$userdir_user/private_html;
                fastcgi_param SCRIPT_FILENAME $request_filename;

                fastcgi_pass 127.0.0.1:9000;

            }
    } 



    location ~ \\.php$ {
            try_files $uri =404;

            fastcgi_split_path_info ^(.+\\.php)(/.+)$;
            include /etc/nginx/fastcgi_params;
            fastcgi_index index.php;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            #fastcgi_pass unix:/usr/local/php55/sockets/webapps.sock;
          fastcgi_pass 127.0.0.1:9000;

    }


    include /etc/nginx/nginx-info.conf;
    include /etc/nginx/webapps.ssl.conf;
}

define( \'WP_SITEURL\', \'http://example.com.mytestdomain.com\' );
define( \'WP_HOME\', \'http://example.com.mytestdomain.com\' );

if ($host ~* ^example\\.com$) {
    rewrite ^(.*)$ https://example.com$1 permanent;
}