参考官方文档，http://nginx.org/en/docs/http/ngx_http_stub_status_module.html

location /basic_status {
        stub_status on;
        access_log off;
        allow 127.0.0.1;
        deny all;
}

This configuration creates a simple web page with basic status data which may look like as follows:

Active connections: 291 
server accepts handled requests
 16630948 16630948 31070465 
Reading: 6 Writing: 179 Waiting: 106

对以上结果的说明：
Active connections
The current number of active client connections including Waiting connections.
accepts
The total number of accepted client connections.
handled
The total number of handled connections. Generally, the parameter value is the same as accepts unless some resource limits have been reached (for example, the worker_connections limit).
requests
The total number of client requests.
Reading
The current number of connections where nginx is reading the request header.
Writing
The current number of connections where nginx is writing the response back to the client.
Waiting
The current number of idle client connections waiting for a request.