nginx如何配置x-forwarded-for头部

 
#user  nobody;
worker_processes  1;
 
#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;
 
#pid        logs/nginx.pid;
 
 
events {
    worker_connections  1024;
}
 
 
http {
    include       mime.types;
    default_type  application/octet-stream;
 
    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';
 
    #access_log  logs/access.log  main;
 
    sendfile        on;
    #tcp_nopush     on;
 
    #keepalive_timeout  0;
    keepalive_timeout  65;
 
    #gzip  on;
 
    server {
        listen       50001;
        server_name  localhost;
 
        #charset koi8-r;
 
        #access_log  logs/host.access.log  main;
 
        location / {
            root   html;
            index  index.html index.htm;
        }
 
        location /ly {
            proxy_pass   http://127.0.0.1:8080/hello.do;
            proxy_set_header            Host $host;  
            proxy_set_header            X-real-ip $remote_addr;  
            proxy_set_header            X-Forwarded-For $proxy_add_x_forwarded_for;  
        }    
 
        #error_page  404              /404.html;
 
        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
    include servers/*;
}

public class MainController extends HttpServlet {
 
    public void doGet(HttpServletRequest request,
                      HttpServletResponse response)
            throws ServletException, IOException
    {
        PrintWriter out = response.getWriter();
        out.println("NGINX FORWARD");
        String ssfAddr = request.getHeader("X-Forwarded-For");
 
        String realIp = request.getHeader("X-Real-IP");
 
        String remoteAddr = request.getRemoteAddr();
 
        System.out.println("X-Forwarded-For: " + ssfAddr);
        System.out.println("X-Real-IP: " + realIp);
        System.out.println("remoteAddr: " + remoteAddr);
 
    }
 
}

X-Forwarded-For: 192.168.43.1
X-Real-IP: 192.168.43.1
remoteAddr: 127.0.0.1

curl http://localhost:50001/ly -H 'X-Forwarded-For: unkonw, <8.8.8.8> 1.1.1.1' -H 'X-Real-IP: 2.2.2.2'

X-Forwarded-For: unkonw, <8.8.8.8> 1.1.1.1, 127.0.0.1
X-Real-IP: 127.0.0.1
remoteAddr: 127.0.0.1