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

其他回答

对于它的价值，我有同样的问题，当传递应用程序到onRequest。我意识到问题在于firebase函数的请求url上的末尾斜杠。Express正在寻找'/'，但我在函数[project-id].cloudfunctions.net/[function-name]上没有后面的斜杠。CORS的错误是假阴性。当我添加后面的斜杠时，我得到了我所期待的响应。

2018-08-21 16:15:45

在https上使用cors。onRequest与Typescript像这样:

import * as cors from 'cors';
const corsHandler = cors({origin: true});

export const pingFunctionWithCorsAllowed = functions.https.onRequest((request, response) => {
  corsHandler(request, response, () => {
    response.send(`Ping from Firebase (with CORS handling)! ${new Date().toISOString()}`);
  });
});

从源

2021-05-30 17:02:56

如果你不/不能使用cors插件，在处理函数中首先调用setCorsHeaders()函数也可以工作。

在回复时也使用respondSuccess/Error函数。

const ALLOWED_ORIGINS = ["http://localhost:9090", "https://sub.example.com", "https://example.com"]


// Set CORS headers for preflight requests
function setCorsHeaders (req, res) {
  var originUrl = "http://localhost:9090"


  if(ALLOWED_ORIGINS.includes(req.headers.origin)){
    originUrl = req.headers.origin
  }

  res.set('Access-Control-Allow-Origin', originUrl);
  res.set('Access-Control-Allow-Credentials', 'true');

  if (req.method === 'OPTIONS') {
    // Send response to OPTIONS requests
    res.set('Access-Control-Allow-Methods', 'GET,POST','PUT','DELETE');
    res.set('Access-Control-Allow-Headers', 'Bearer, Content-Type');
    res.set('Access-Control-Max-Age', '3600');
    res.status(204).send('');
  }
}

function respondError (message, error, code, res) {
  var response = {
    message: message,
    error: error
  }
  res.status(code).end(JSON.stringify(response));
}


function respondSuccess (result, res) {
  var response = {
    message: "OK",
    result: result
  }
  res.status(200).end(JSON.stringify(response));
}

2019-12-23 12:29:15

云功能日志有助于检查您是否卡住了。

我的问题原来是我的云函数上的一个类型错误，我有一个数字，其中一个字符串是预期的:

TypeError [ERR_INVALID_ARG_TYPE]: The first argument must be of type string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object. Received type number (1)

出于某种原因，这给了我cors错误的前端，它成为了几个小时的浪费。

2021-08-21 06:50:54

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

在Firebase的云功能中启用CORS

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