1、nodejs Get the real client IP Address :

In the general management website , You need to record some of the user's actions , And remember which user did it , At this time, the user's ip Address , But often when these applications are deployed on the server , It's all used ngix etc.

agent , When the user accesses it , You need to check the user's real life through the agent IP Address , Here are nodejs Get client reality IP Code for :

// Get client reality ip;
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;

in addition , I saw someone else write like this on the Internet :

// Code , The first paragraph judges whether there is a reverse proxy IP( Header information :x-forwarded-for), In judging connection Remote IP, And the back end socket Of IP.
function getClientIp(req) {
return req.headers['x-forwarded-for'] ||
req.connection.remoteAddress ||
req.socket.remoteAddress ||

2、nodejs Dynamic pages refer to content in static paths

Reference the content under the static introduction path in the dynamic page ( Such as images ,css When you file ), Pay attention to the way the path is written :

for example : I am here error.html I quote “public/images/” Under the error.png picture , It takes a few steps :

The structure of the project :

First step :app.js in :

app.use(express.static(path.join(__dirname, 'public')));// Indicates that a dynamic page can be referenced public Static information under the path 

The second step :error.html in :

stay style in , When quoting a background picture , You can't add more before the path “public/”, Only for :“images/error.png”, Because in app.js The dynamic page can only be referenced in public Static content under , And by default it's in public Under the path , Just write from public It's OK to start writing the lower level directory of .

 <!DOCTYPE html>
<head lang="en">
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width initial-scale=1.0 maximum-scale=1.0 user-scalable=no" />
<title> Unified payment </title>
section{display: block;}
.module-error .error-main{ margin: 0 auto;width: 420px;}
.module-error .label{float: left;width: 160px;height: 151px;background: url("images/error.png") 0 0 no-repeat;}// The default is already in public Under the path , Even though the code changes in IDE Error reported in ( Don't worry about it )
.module-error .info{ margin-left: 182px;line-height: 1.8;}
.module-error .title{color: #666;font-size: 14px;}
.module-error .reason{margin: 8px 0 18px 0;color: #666;font-size: 12px;}
<body class="error-404">
<div id="doc_main">
<section class="bd clearfix">
<div class="module-error">
<div class="error-main clearfix">
<div class="label"></div>
<div class="info">
<h3 class="title"> Ah! , The page you visited no longer exists .</h3>
<div class="reason">
<p> Probable cause :</p>
<p>1. Wrong address entered in the address bar .</p>
<p>2. A link you click on has expired .</p>
<div class="oper">
<p><a href="/"> Back to the front page &gt;</a></p>
<p class="reason"> or 10s After that, it will automatically jump to the home page </p>
</script> </body>


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