(Nodejs + Angular 6+ socket.io)中的CORS问题
(Nodejs + Angular 6+ socket.io)中的CORS问题
提问于 2020-03-18 19:57:25
当我们试图连接到服务器时，我们在Angular 6中遇到了使用socket.io客户端的CORS问题。
我们在浏览器的控制台中得到的错误。
Access to XMLHttpRequest at 'http://********.com/socket.io/?EIO=3&transport=polling&t=N3jTiAZ' from origin 'http://localhost:4200' has been blocked by CORS policy:
The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'.
The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.以下是服务器代码
const express = require('express');
const bodyParser = require('body-parser');
const app = express();
const server = require('http').createServer(app);
const conn = app.listen("3000")
const io = require('socket.io').listen(conn);
io.origins('*:*')
var connectioncheck = io.of('/check-connection');
connectioncheck.on('connection', function (socket) {
console.log('user connected');
});以下是使用简单的html和js的前端代码
<script src="https://cdn.jsdelivr.net/npm/socket.io-client@2/dist/socket.io.js"></script>
var socket = io.connect('http://********.com/check-connection');
socket.emit('connection', "hello",function(db){
console.log(db);
console.log("data from callback");
});回答 1
Stack Overflow用户
发布于 2020-03-18 20:13:20
根据您上面的评论，我认为您应该以类似this的方式使用NPM CORS。
let allowedOrigins = ["http://ServerA:3000", "http://ServerB:3000"]
let origin = req.headers.origin;
if (allowedOrigins.includes(origin)) {
res.header("Access-Control-Allow-Origin", origin); // restrict it to the required domain
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/60739097
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