2016-04-07-express-slash-how-to-set-header-to-allow-cross-domain-access-using-cors.md

layout	title	date	comments	categories
post	express/How to set header to allow cross-domain access using CORS	2016-04-07 01:36:31 +0800	true	express, node, cors

How to set header to allow cross domain using CORS

If you use express to develop a APP, a browser display a error:

XMLHttpRequest cannot load http://localhost:3000/user. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:63342' is therefore not allowed access.

You can add the code to your app:

var express = require('express');
var db = require('../common/db/db.config').db;
db.bind('user');
var app = express();

//设置跨域访问  
app.all('*', function(req, res, next) {  
    res.header("Access-Control-Allow-Origin", "*");  
    res.header("Access-Control-Allow-Headers", "X-Requested-With");  
    res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");  
    res.header("X-Powered-By",' 3.2.1')  
    res.header("Content-Type", "application/json;charset=utf-8");  
    next();  
});

Enjoy yourself;