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。
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
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));
}
