我正在遵循Vercel的指南。他们描述了There,我必须configuring a few headers in the response object
才能启用CORS。
我的问题是,我不了解他们提供的代码。他们提供使用CORS的代码是什么,以及如何使用它将标头附加到我的响应并接收对象?
最诚挚的问候
Vercel的标题
const allowCors = fn => async (req, res) => {
res.setHeader('Access-Control-Allow-Credentials', true)
res.setHeader('Access-Control-Allow-Origin', '*')
// another common pattern
// res.setHeader('Access-Control-Allow-Origin', req.headers.origin);
res.setHeader('Access-Control-Allow-Methods', 'GET,OPTIONS,PATCH,DELETE,POST,PUT')
res.setHeader(
'Access-Control-Allow-Headers',
'X-CSRF-Token, X-Requested-With, Accept, Accept-Version, Content-Length, Content-MD5, Content-Type, Date, X-Api-Version'
)
if (req.method === 'OPTIONS') {
res.status(200).end()
return
}
return await fn(req, res)
}
const handler = (req, res) => {
const d = new Date()
res.end(d.toString())
}
服务器代码
const express = require("express");
const cors = require('cors');
const monk = require("monk");
const Filter = require('bad-words');
const rateLimit = require("express-rate-limit");
const app = express();
const db = monk(process.env.MONGODB_URI);
const posts = db.get("post");
const filter = new Filter();
app.use(cors());
app.use(express.json());
app.get("/", (req, res) => {
res.json({
message: "POST"
});
});
app.get("/beitraege", (req, res)=> {
posts
.find()
.then(posts => {
res.json(posts)
})
})
function isValidPost(post){
return post.name && post.name.toString().trim() !== "" &&
post.content && post.content.toString().trim() !=="";
}
app.use(rateLimit({
windowMs: 30 * 1000, // 30 sec
max: 1 // limit each IP to 100 requests per windowMs
}));
app.post("/beitraege", (req, res) => {
if (isValidPost(req.body)){
const post = {
name: filter.clean(req.body.name.toString()),
content: filter.clean(req.body.content.toString()),
created: new Date()
};
//console.log(post);
posts
.insert(post)
.then(createdPost => {
res.json(createdPost);
})
.catch(err => {
return Promise.reject();
})
}else {
res.status(422);
res.json({
message: "Hey, Titel und Inhalt werden benötigt!"
});
}
});
app.listen(5000, () => {
console.log('Listening on http://localhost:5000');
});