Nginx作为反向代理时传递客户端IP的设置方法

server {

    listen       8080;
    server_name  localhost;
    location / {
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Credentials' 'true';
        add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS';
        add_header 'Access-Control-Allow-Headers' 'reqid, nid, host, x-real-ip, x-forwarded-ip, event-type, event-id, accept, content-type, Authorization';
   client_max_body_size 5m;

        if ($request_method = "OPTIONS") {
            add_header 'Access-Control-Max-Age' 86400;
            add_header 'Access-Control-Allow-Origin' '*' always;
            add_header 'Access-Control-Allow-Credentials' 'true';

            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'reqid, nid, host, x-real-ip, x-forwarded-ip, event-type, event-id, accept, content-type, Authorization';
            add_header 'Content-Length' 0;
            add_header 'Content-Type' 'text/plain, charset=utf-8';
            return 204;
        }





        proxy_pass     http://localhost:9002;
        proxy_redirect off;
        proxy_set_header Host $host:$server_port;
        proxy_set_header  X-Real-IP  $remote_addr;
        proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;
    }

}

在后台拿到请求的header中的X-Forwarded-For的值，根据逗号截取字符串后的第一个值就是ip