Chrome阻止了PUT / DELETE，但它们可以在Firefox中使用

Question

我试图用很多不同的方式设置cors，看看我是否可以解决这个问题。我无法获得适用于chrome的PUT / DELETE请求。但是他们适用于Firefox。我将粘贴下面的代码片段！

index.js

const express = require('express');
const bodyParser = require('body-parser');
const mongoose = require('mongoose');
const cookieParser = require('cookie-parser')
const cors = require('cors');

const ioHelper = require('./controllers/ioHelper')
const routes = require('./routes/routes');

require('dotenv').load();

const port = process.env.PORT || 3001;
const app = express();

app.use(cookieParser())
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(cors())
app.use(function (req, res, next) { 
    res.header("Access-Control-Allow-Origin", "*"); 
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept"); 
    next(); 
});

const server = app.listen(port);
const io = require('socket.io')(server)
ioHelper(io)

routes(app);

mongoose.Promise = global.Promise;
mongoose.connect(process.env.DB_CONNECT, { useMongoClient: true });

module.exports = app;