在向React App中发送请求向Express Server发送请求时，如何解决CORS错误

发布于 2025-02-12 08:04:34 字数 452 浏览 0 评论 0原文

当我在本地运行应用程序和服务器时，没有问题。但是，一旦我部署了Express服务器，每次提出请求时，都会收回以下错误。

“已被CORS策略所阻止：对飞行前请求的响应不会传递访问控制检查：在请求的资源上没有'访问控制 - 允许孔'标头。”

我的服务器正在使用CORS，我还尝试执行App.Options（*，CORS（）），但这也行不通。我几乎尝试了在网上找到的所有解决方案。

这就是我在Express Server的索引中所拥有的。


app.options("*", cors());

app.use(bodyParser.json({ limit: "30mb", extended: true }));

app.use(cors());

app.get("/", (req, res) => {
  res.send("Food Tracker Server");
});```

原文

When I run both the app and the server locally, there is no issue. However, once I deploy the express server, every time I make a request, I get back the following error.

"has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource."

My server is using cors, and I also tried doing app.options(*, cors()) but that won't work either. I have tried just about every solution online that I could find.

This is what I have in the index.js of the express server.


app.options("*", cors());

app.use(bodyParser.json({ limit: "30mb", extended: true }));

app.use(cors());

app.get("/", (req, res) => {
  res.send("Food Tracker Server");
});```

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

不爱素颜 2025-02-19 08:04:34

像这样配置您的cors：

var express = require('express')
var cors = require('cors')
var app = express()
 
var corsOptions = {
  origin: 'http://example.com',
  optionsSuccessStatus: 200 // some legacy browsers (IE11, various SmartTVs) choke on 204
}
 
app.get('/', cors(corsOptions), function (req, res, next) {
  res.json({msg: 'This is CORS-enabled for only example.com.'})
})
 
app.listen(80, function () {
  console.log('CORS-enabled web server listening on port 80')
})

config your cors like this :

var express = require('express')
var cors = require('cors')
var app = express()
 
var corsOptions = {
  origin: 'http://example.com',
  optionsSuccessStatus: 200 // some legacy browsers (IE11, various SmartTVs) choke on 204
}
 
app.get('/', cors(corsOptions), function (req, res, next) {
  res.json({msg: 'This is CORS-enabled for only example.com.'})
})
 
app.listen(80, function () {
  console.log('CORS-enabled web server listening on port 80')
})

回复收藏 0 原文

~没有更多了~