nginx：如何获取实际客户端 ip？

Question

I have a simple express app. which is Dockerized . This is Repository .

I used nginx as a reverse proxy there. when I visit http://45.33.97.232:3000 , it gives me the actual IP . But, when I visit http://45.33.97.232/ , It gives me the same server IP . But I need actual Client IP here. And I am using Server IP in nginx config file. but I have a restriction, I can't write Server IP in nginx config file.

This is my nginx config file,

server {
    listen 80 default_server;
    server_name 45.33.97.232;
location / {
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_pass http://45.33.97.232:3000; #port where you are serving your express app.
  }
}

Answer 1

In nginx if you want to pass through the IP address of the remote user to your backend web server you have to set X-Forwarded-For header to this remote ip, Like this:

proxy_set_header X-Forwarded-For $remote_addr;

and if you do not want to use server IP you can use the domain in your Nginx config file.