Solve the problem that the IP address obtained using nginx is 127.0.0.1

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.HttpServletRequest;

/**
 * IP address *
 * @date March 6, 2020 12:57:02 PM
 */
@Slf4j
public class IPUtils {

    /**
     * Get IP address * 
     * If you use reverse proxy software such as Nginx, you cannot get the IP address through request.getRemoteAddr()* If you use multiple levels of reverse proxy, the value of X-Forwarded-For is not just one, but a string of IP addresses. The first valid IP string that is not unknown in X-Forwarded-For is the real IP address*/
    public static String getIpAddr(HttpServletRequest request) {
        String ip = null;
        try {
            ip = request.getHeader("x-forwarded-for");
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
            }
            if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_CLIENT_IP");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
            }
        } catch (Exception e) {
            log.error("IPUtils ERROR ", e);
        }
        
        //Using a proxy, get the first IP address if(StringUtils.isEmpty(ip) && ip.length() > 15) {
            if(ip.indexOf(",") > 0) {
                ip = ip.substring(0, ip.indexOf(","));
            }
        }
        
        return ip;
    }
    
}

server {
        listen 80;
        server_name api.qimen.pro;
        # Server file upload size limit client_max_body_size 10M;
        location / {
            proxy_pass http://gymserver;
            proxy_set_header x-forwarded-for $remote_addr;
        }
    }