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Example of doing Ajax request with credential under CORS (Node.js + Express)
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| // npm i express cookie-parser | |
| // | |
| // node ajax-under-cors-example.js | |
| // | |
| // open http://localhost:12300/ | |
| // => Step 3 will work. | |
| // | |
| // open http://AnotherHostNameOfYourMachine:12300/ | |
| // => Step 3 will fail due to SameSite issue of Cookie. | |
| // | |
| const express = require('express') | |
| const cookieParser = require('cookie-parser') | |
| const originServer = express() | |
| { | |
| originServer.get('/', (req, res) => { | |
| res.send(`\ | |
| <!doctype html> | |
| <html lang="en"> | |
| <head><title></title></head> | |
| <body> | |
| <ol> | |
| <li>Get the credentail cookie at <a href="http://localhost:23400/get-credential">get-credential</a></li> | |
| <li>Issue CORS request by clicking <button onclick="issueCors()">This</button></li> | |
| <li>Finally you got: <code id="result"></code></li> | |
| </ol> | |
| <script> | |
| function issueCors() { | |
| fetch("http://localhost:23400/cors-target", { | |
| method: 'POST', credentials: 'include', mode: 'cors', | |
| headers: {'Content-Type': 'application/json'}, | |
| body: '{}'}) | |
| .then((response) => response.text()) | |
| .then((text) => document.getElementById("result").innerText = text) | |
| } | |
| </script> | |
| </body> | |
| </html> | |
| `) | |
| }) | |
| originServer.listen(12300, () => console.log(`originServer ready.`)) | |
| } | |
| const crossDomainServer = express() | |
| { | |
| crossDomainServer.use(cookieParser()) | |
| crossDomainServer.get('/get-credential', (req, res) => { | |
| res.cookie('auth', '__SECRET__') | |
| res.send('You got an credential cookie.') | |
| }) | |
| function setCorsHeader(req, res) { | |
| res.set('Access-Control-Allow-Credentials', 'true') | |
| res.set('Access-Control-Allow-Origin', req.get('Origin')) | |
| res.set('Access-Control-Allow-Headers', 'Content-Type') | |
| res.set('Access-Control-Allow-Methods', 'POST, OPTIONS') | |
| res.set('Vary', 'Origin') | |
| } | |
| crossDomainServer.options('/cors-target', (req, res) => { | |
| setCorsHeader(req, res) | |
| res.sendStatus(200) | |
| }) | |
| crossDomainServer.post('/cors-target', (req, res) => { | |
| setCorsHeader(req, res) | |
| if (req.cookies.auth === '__SECRET__') { | |
| res.send('You are authorized.') | |
| } else { | |
| res.send('No credentail!') | |
| } | |
| }) | |
| crossDomainServer.listen(23400, () => console.log(`crossDomainServer ready.`)) | |
| } | |
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