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。
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!");
});
Firebase v2的云功能
Firebase v2的云函数现在允许您直接在HTTP选项中配置cors。它的工作不需要任何第三方软件包:
import { https } from 'firebase-functions/v2';
export myfunction = https.onRequest({ cors: true }, async (req, res) => {
// this will be invoked for any request, regardless of its origin
});
请注意:
在撰写本文时,v2正在公开预览中。
目前v2中只支持区域的一个子集。
函数名被限制为小写字母、数字和破折号。
你可以在一个代码库中同时使用v1和v2函数。为了提高可读性,请更新导入以分别访问firebase-functions/v1或firebase-functions/v2。