Angular 6 - 请求的资源上不存在“Access-Control-Allow-Origin"标头 [英] Angular 6 - No 'Access-Control-Allow-Origin' header is present on the requested resource
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问题描述
我有一个 Angular 6 项目,它有一个指向 server.js 的服务
I have an Angular 6 project, which has a service with is pointing to a server.js
Angular is on port: 4200 and Server.js is on port: 3000.
当我将服务指向 http://localhost:3000/api/posts
(Server.js 位置)时,我收到此错误:
When I point the service to http://localhost:3000/api/posts
(Server.js location), I'm getting this error:
Failed to load http://localhost:3000/api/posts: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4200' is therefore not allowed access.
这是 server.js 代码:
Here is the server.js code:
// Get dependencies
const express = require('express');
const path = require('path');
const http = require('http');
const bodyParser = require('body-parser');
// Get our API routes
const api = require('./server/routes/api');
const app = express();
// Parsers for POST data
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
// Point static path to dist
app.use(express.static(path.join(__dirname, 'dist')));
// Set our api routes
app.use('/api', api);
// Catch all other routes and return the index file
app.get('*', (req, res) => {
res.sendFile(path.join(__dirname, 'dist/myproject/index.html'));
});
/**
* Get port from environment and store in Express.
*/
const port = process.env.PORT || '3000';
app.set('port', port);
/**
* Create HTTP server.
*/
const server = http.createServer(app);
/**
* Listen on provided port, on all network interfaces.
*/
server.listen(port, () => console.log(`API running on localhost:${port}`));
我的问题是:
如何让 server.js 允许这个调用?
How to I get server.js to allow this call?
推荐答案
If you are using Express, you can try this cors package.
EDIT:
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')
})
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