nginx.conf文件中有这一段
server {

    listen       80;
    server_name  hello.test.com;

    location / {
        root   html;
        index  index.html index.htm;
    }

    location /aa {
        root   /data1/htdocs/hello.test.com;
        index  index.html;
    }
}

配置location的时候，按照规则，我访问hello.test.com/aa
应该会访问/data1/htdocs/hello.test.com/index.html
然而实际是 404 not found
我查看error.log看到

2016/08/07 10:53:40 [error] 4686#0: *8 open() "/data1/htdocs/hello.test.com/aa" failed (2: No such file or directory), client: 192.168.31.198, server: hello.test.com, request: "GET /aa HTTP/1.1", host: "hello.test.com"

然而确是在访问 hello.test.com/aa 这个目录了，而我的目录下没有这个文件，这是什么情况，求解