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

在云函数中可以这样设置CORS

response.set('Access-Control-Allow-Origin', '*');

不需要导入cors包

2018-08-19 23:10:32

其他回答

我得到了错误，因为我调用了一个在客户端不存在的函数。例如:

firebase.functions().httpsCallable('makeSureThisStringIsCorrect');

2021-05-30 01:09:54

这可能会有帮助。我创建了firebase HTTP云功能与express(自定义URL)

const express = require('express');
const bodyParser = require('body-parser');
const cors = require("cors");
const app = express();
const main = express();

app.post('/endpoint', (req, res) => {
    // code here
})

app.use(cors({ origin: true }));
main.use(cors({ origin: true }));
main.use('/api/v1', app);
main.use(bodyParser.json());
main.use(bodyParser.urlencoded({ extended: false }));

module.exports.functionName = functions.https.onRequest(main);

请确保您添加了重写部分

"rewrites": [
      {
        "source": "/api/v1/**",
        "function": "functionName"
      }
]

2019-04-01 23:43:31

对于任何试图在Typescript中这样做的人来说，这是代码:

    import * as cors from 'cors';
    const corsHandler = cors({origin: true});
        
    export const exampleFunction= functions.https.onRequest(async (request, response) => {
           corsHandler(request, response, () => { 
             //Your code here
           });
           
    });

2018-06-22 16:29:15

通过这么多的搜索，我可以在相同的firebase文档中找到这个解决方案，只是在路径中实现cors:

import * as express from "express";
import * as cors from "cors";


const api = express();
api.use(cors({ origin: true }));
api.get("/url", function);

链接firebase文档:https://firebase.google.com/docs/functions/http-events

2021-02-19 23:21:33

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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