I have a React app (localhost:3000) and a Node app (localhost:3001) to run a simple system. The problem is I'm getting the error Access to XMLHttpRequest at 'localhost:3001/app' from origin 'http://localhost:3000' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, chrome-untrusted, https.
I have tried with app.use(cors()) and also with cors options as below. Still I'm getting the above error.
Node app.js
const express = require('express');
const app = express();
const cors = require('cors');
const corsOptions = {
origin: 'http://localhost:3000/',
credentials: true,
optionSuccessStatus: 200
}
app.use(cors(corsOptions));
app.use(function (req, res, next) {
res.header('Access-Control-Allow-Origin', "http://localhost:3000");
res.header('Access-Control-Allow-Headers', true);
res.header('Access-Control-Allow-Credentials', true);
res.header('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');
next();
});
app.use(express.json());
app.get('/app', (req, res) => {
res.send({result: "hello"});
});
module.exports = app;
React app.js
import React, { Component } from "react";
import axios from 'axios';
class App extends Component {
componentDidMount(){ this.runInstance(); }
runInstance = () => {
axios.get(`localhost:3001/app`)
.then(res => {
console.log("res", res);
})
.catch(err => {
console.log("AXIOS ERROR:", err);
})
}
render() { return(<div></div>) }
}
export default App;
How can I solve this?
You are using a different port to the one defined in corsOptions, try like below.
// app.js
...
runInstance = () => {
axios.get(`http://localhost:3000/app`)
.then(res => {
console.log("res", res);
})
.catch(err => {
console.log("AXIOS ERROR:", err);
})
}
...
Update:
Change all references to 3000 to be 3001, so that your CORS configuration matches the request you are trying to make.
const corsOptions = {
origin: 'http://localhost:3001/',
credentials: true,
optionSuccessStatus: 200
}
...
app.use(function (req, res, next) {
res.header('Access-Control-Allow-Origin', "http://localhost:3001");
...
});
Since you use nodejs
installing cors
npm install cors
After that
var express = require('express')
var cors = require('cors')
var app = express()
app.use(cors())
app.get('/products/:id', function (req, res, next) {
res.json({msg: 'This is CORS-enabled for all origins!'})
})
app.listen(80, function () {
console.log('CORS-enabled web server listening on port 80')
})
Then after applying "cors" middleware. You need to insert "http://" before "localhost: in your react app".
Example
axios.get(`http://localhost:3001/api/app`)
.then(res => {
console.log("res", res);
})
.catch(err => {
console.log("AXIOS ERROR:", err);
})