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A note about Laravel Route redirection

高洛峰
Release: 2023-03-05 18:46:02
Original
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发现问题

最近在做项目发现一个奇怪的现象,我的路由配置里有如下配置:

Route::group(array('prefix'=>'admin','before'=>'adminauth'),function(){
 // 管理员登录
 Route::get('/',function(){
 return Redirect::to('admin/login');
 });
 Route::get('login','UserController@adminLogin');
}
Copy after login

目的是无论用户输入”admin”,还是”admin/login”都能跳转到登录界面。然而现实情况是输入”admin”之后,浏览器会无限重定向,firebug记录如下:

GET /public/admin/ 301 Moved Permanently 
GET admin  301 Moved Permanently
GET admin  301 Moved Permanently
GET /public/admin/ 301 Moved Permanently
GET admin  301 Moved Permanently
GET /public/admin/ 301 Moved Permanently
GET admin  301 Moved Permanently
....
Copy after login

经过一番搜索后试验,终于得出结论,问题有两点:

1.public目录下正好有个admin目录,存放后台相关js和css

2.laravel自带的.htaccess的这样一条规则:

RewriteEngine On
# Redirect Trailing Slashes...
RewriteRule ^(.*)/$ /public/$1 [L,R=301] #注意这条
 
# Handle Front Controller...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]
Copy after login

解释一下原理:

访问public/admin目录时,apache会自动转成”public/admin/”的形式,而这种形式正好符合重写的规则,又被重写回”public/admin”的形式。因为public/admin目录确实存在,所以请求根本不会到达index.php。

所以故事就是这样,因为301那条规则的存在,无限重定向产生了。

解决方案:

1.不要把public目录下已有的目录名做为路由地址

2.301规则前加一条”RewriteCond %{REQUEST_FILENAME} !-d”,但是这样会使该目录被直接访问。建议生产环境中关掉apache的autoindex模块(呃,我发现我用的wamp关掉这个模块apache就启动不了了- -!)。

补充:

经过一些实验,建议将.htaccess文件改成如下:

RewriteEngine On
# Redirect Trailing Slashes...
RewriteCond %{REQUEST_FILENAME} !-d  #防止真实目录导致循环重定向
RewriteRule ^(.*)/$ /public/$1 [L,R=301]
 
# Handle Front Controller...
#RewriteCond %{REQUEST_FILENAME} !-d  #防止用户直接打开真实目录
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]
Copy after login

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