This seems ridiculous but I've not found a working answer in over an hour of searching.
When I access "<http://oa.wechat.com/screen/index.html>", it will cause a 301 redirect loop, like this:

```
"GET /screen/ HTTP/1.1" 301
"GET /screen/index.html/ HTTP/1.1" 301 
"GET /screen/index.html/index.html/ HTTP/1.1" 301 
... 

```

nginx verson: 1.5.6
nginx.conf

```
    server {
        listen  80;
        server_name oa.wechat.com;

        location ~ ^/screen/ {
            alias /data/screen/static/;
            index index.html;
        }  
    } 

```

Could anyone tell me the reason? Thanks very much.

i have checked nginx document. the right usage of 'alias':

```
    # use normal match like this
    location  /i/ {
      alias  /spool/w3/images/;
    }

    # use regex match like this
    location ~ ^/download/(.*)$ {
      alias /home/website/files/$1;
    }

```

the wrong way to use 'alias' is:

```
    location ~ ^/screen/ {
        alias /data/screen/static/;
        index index.html;
    }  

```

In this case, the request would be considered as a directory request, not file request, which will lead a redirect loop.

Anyway, Thanks Flesh very much!