路由美化问题：url始终显示的是首页页面的内容 [ 2.0 版本 ]

nginx设置：

server {
        listen       80;
        server_name  yii.com alias www.yii.com;
        location / {
            root   d:/web/www/yii/web/;
            index  index.html index.htm default.html default.htm index.php default.php app.php u.php;
			include        d:/web/www/yii/web/up-*.conf;

try_files $uri $uri/ /index.php$is_args$args;
        }
		autoindex off;
		include advanced_settings.conf;
		#include expires.conf;
		location ~* .*\/(attachment|attachments|uploadfiles|avatar)\/.*\.(php|php5|phps|asp|aspx|jsp)$ {
        deny all;
        }

        location ~ ^.+\.php {
            root           d:/web/www/yii/web/;
            fastcgi_pass   bakend;
            fastcgi_index  index.php;
			fastcgi_split_path_info ^((?U).+\.php)(/?.+)$;
			fastcgi_param  PATH_INFO $fastcgi_path_info;
			fastcgi_param  PATH_TRANSLATED $document_root$fastcgi_path_info;
            include        fastcgi.conf;
        }
		}
#server yii.com end}

第二个：config下的web.php设置：
在

'components' => [
//rewrite路由（pathinfo）的形式访问  yii配置pathinfo
        'urlManager' => [
            'enablePrettyUrl' => true,
            'showScriptName' => false,
            'enableStrictParsing' => true,
            'rules' => [
                　'/' => '/site/index',　　//这里
                '<controller:\w+>/<id:\d+>'=>'<controller>/view',
                "<controller:\w+>/<action:\w+>"=>"<controller>/<action>",
            ],
        ],

目前url访问是这样的：

http://www.yii.com/index.php?r=site%2Findex
http://www.yii.com/index.php?r=site%2Fabout
http://www.yii.com/index.php?r=site%2Fcontact
http://www.yii.com/index.php?r=site%2Flogin

上面这些路径访问正常

想实现 像下面的url：

http://www.yii.com/
http://www.yii.com/about
http://www.yii.com/contact
http://www.yii.com/login

现在访问这些目录显示的页面内容都是首页的，不知道是哪里错了