在Firebase的云功能中启用CORS

我目前正在学习如何使用Firebase的新云函数，我遇到的问题是我无法访问我通过AJAX请求编写的函数。我得到了“No 'Access-Control-Allow-Origin'”错误。下面是我写的函数示例:

exports.test = functions.https.onRequest((request, response) => {
  response.status(500).send({test: 'Testing functions'});
})

函数位于这个url中: https://us-central1-fba-shipper-140ae.cloudfunctions.net/test

Firebase文档建议在函数中添加CORS中间件，我尝试过，但对我不起作用:https://firebase.google.com/docs/functions/http-events

我是这样做的:

var cors = require('cors');    

exports.test = functions.https.onRequest((request, response) => {
   cors(request, response, () => {
     response.status(500).send({test: 'Testing functions'});
   })
})

我做错了什么?如果你能帮我，我会很感激。

更新:

道格·史蒂文森的回答很有帮助。添加({origin: true})修复了这个问题，我还必须将response.status(500)更改为response.status(200)，这是我一开始完全错过的。

当前回答

我已经试了很长时间了。

当我做出这个改变时，它终于起作用了。

app.get('/create-customer', (req, res) => {
  return cors()(req, res, () => {
    ... your code ...

最大的区别是我使用了cors()(req, res…而不是直接cors(req, res…

它现在工作得很完美。

2021-04-02 23:20:35

其他回答

我是Firebase的初学者(30分钟前注册的)。我的问题是我调用了端点

https://xxxx-default-rtdb.firebaseio.com/myendpoint

而不是

https://xxxx-default-rtdb.firebaseio.com/myendpoint.json

如果您刚开始使用Firebase，请确保不要忘记.json扩展名。

2021-03-21 05:11:05

如果您更喜欢使用单个处理程序函数(参考答案)

const applyMiddleware = handler => (req, res) => {
  return cors(req, res, () => {
    return handler(req, res)
  })
}
exports.handler = functions.https.onRequest(applyMiddleware(handler))

2021-03-12 00:49:28

在我的例子中，错误是由云函数调用者限制访问引起的。请将allUsers添加到云函数调用器。请抓住林克。更多信息请参考文章

2020-04-14 16:52:56

没有CORS解决方案对我有效…直到现在!

Not sure if anyone else ran into the same issue I did, but I set up CORS like 5 different ways from examples I found and nothing seemed to work. I set up a minimal example with Plunker to see if it was really a bug, but the example ran beautifully. I decided to check the firebase functions logs (found in the firebase console) to see if that could tell me anything. I had a couple errors in my node server code, not CORS related, that when I debugged released me of my CORS error message. I don't know why code errors unrelated to CORS returns a CORS error response, but it led me down the wrong rabbit hole for a good number of hours...

dr -如果没有CORS解决方案工作，检查您的firebase函数日志并调试任何错误

2018-06-29 13:37:42

Go into your Google Cloud Functions. You may have not seen this platform before, but it's how you'll fix this Firebase problem. Find the Firebase function you're searching for and click on the name. If this page is blank, you may need to search for Cloud Functions and select the page from the results. Find your function, click on the name. Go to the permissions tab. Click Add (to add user). Under new principles, type 'allUsers' -- it should autocomplete before you finish typing. Under select a role, search for Cloud Functions, then choose Invoker. Save. Wait a couple minutes.

这应该能解决问题。如果没有，就这样做，并在你的函数代码中添加一个CORS解决方案，比如:

  exports.sendMail = functions.https.onRequest((request, response) => {
  response.set("Access-Control-Allow-Origin", "*");
  response.send("Hello from Firebase!");
});

2022-01-05 11:41:03

在Firebase的云功能中启用CORS

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