Nodejs get client IP

//  Method 1
function getClientIp(req) {
    
    var ipAddress;
    var forwardedIpsStr = req.headers['X-Forwarded-For'];// Determine whether there is reverse proxy header information 
    if (forwardedIpsStr) {
    // If there is , Take out the first address in the header information , The address is the real client IP;
        var forwardedIps = forwardedIpsStr.split(',');
        ipAddress = forwardedIps[0];
    }
    if (!ipAddress) {
    // If there is no direct access IP;
        ipAddress = req.connection.remoteAddress;
    }
    return ipAddress;
};

//  Method 2
 function getClientIp2(req) {
    
        return req.headers['x-forwarded-for'] ||
        req.connection.remoteAddress ||
        req.socket.remoteAddress ||
        req.connection.socket.remoteAddress;
  };
  
const http = require('http')

const server = http.createServer()

// Get client reality ip
function getClientIp(req) {
    
  return req.headers['x-forwarded-for'] ||
  req.connection.remoteAddress ||
  req.socket.remoteAddress ||
  req.connection.socket.remoteAddress;
};

server.on('request',(req, res) => {
    
  const url = req.url;
  const method = req.method;
  
  const str = ` The address you requested :${
     url}, Request method :${
     method}`
  //  Set request header , Solve the problem of Chinese garbled code 
  res.setHeader('Content-Type','text/html;charset=utf-8')
  res.write('ip', 'utf8', () => {
    
    console.log('ippp', getClientIp(req))
  })

  //  Send data to the client and end the request 
  res.end(str)
})

server.listen('81',() => {
    
  console.log('start')
})