Nginx混淆$fastcgi_script_name和$fastcgi_path_info

Question

以下是我的Nginx配置文件的相关部分：

http {
    log_format  fastcgi
                '$remote_addr - $remote_user [$time_local] "$request" '
                '$status $body_bytes_sent "$http_referer" '
                '"$fastcgi_script_name" "$fastcgi_path_info"';

    server {
        listen       8080;
        server_name  localhost;

        access_log  /usr/local/var/log/nginx/access.log  fastcgi;

        location / {
            fastcgi_index /;
            fastcgi_pass unix:/usr/local/var/www/run/httpd.sock;
            include fastcgi_params;
        }
    }
}

基本上，我在/usr/local/var/www/run/httpd.sock有一个用于处理FastCGI请求的Unix套接字，它工作得很好。这里的问题是，Nginx认为URI的最后一部分是脚本名，但它应该是路径信息。例如

⇒ nginx -v
nginx version: nginx/1.15.0
⇒ nginx
⇒ curl -i localhost:8080/index
HTTP/1.1 200 OK
Server: nginx/1.15.0
Date: Tue, 10 Jul 2018 12:27:15 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: keep-alive

<p>hello, world</p>
⇒ tail -n 1 /usr/local/var/log/nginx/access.log
127.0.0.1 - - [10/Jul/2018:20:27:15 +0800] "GET /index HTTP/1.1" 200 30 "-" "/index" ""

这意味着$fastcgi_script_name为/index，$fastcgi_script_name为空字符串。

如何将Nginx配置为使$fastcgi_script_name包含URI的最后一部分，例如/index