为什么一个可调用的客户机调用两次onCall firebase函数？
为什么一个可调用的客户机调用两次onCall firebase函数？
提问于 2020-02-22 13:37:34
我的客户端代码只调用该函数一次，但在服务器日志上显示了两次单独的调用。但是，每对代码中的第一个似乎并没有实际处理我的服务器端代码--这是预期的行为吗？
onCall函数：
const functions = require('firebase-functions');
exports.test = functions
.region('asia-northeast1')
.https
.onCall(async (data, context) => {
console.log('function test: start')
if (!context.auth) {
console.log('function test: throwing permission-denied');
throw new functions.https.HttpsError('permission-denied', 'Mysterious');
}
console.log('function test: no error, user authorised');
});客户端HTML：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Test</title>
<script defer src="/__/firebase/7.7.0/firebase-app.js"></script>
<script defer src="/__/firebase/7.7.0/firebase-auth.js"></script>
<script defer src="/__/firebase/7.7.0/firebase-firestore.js"></script>
<script defer src="/__/firebase/7.7.0/firebase-messaging.js"></script>
<script defer src="/__/firebase/7.7.0/firebase-storage.js"></script>
<script defer src="/__/firebase/7.7.0/firebase-functions.js"></script>
<script defer src="/__/firebase/init.js"></script>
</head>
<body>
<script src="app.js"></script>
<button onclick="login()">
Login with Google
</button>
<button onclick="logout()">
Log out
</button>
<button onclick="test()">
test
</button>
</body>
</html>客户端JS：
var user, app, functions, callableTest;
document.addEventListener("DOMContentLoaded", async event => {
app = firebase.app();
functions = app.functions('asia-northeast1');
callableTest = functions.httpsCallable('test');
user = await firebase.auth().currentUser;
console.log('user: ' + user);
});
async function login() {
user = await firebase.auth().signInWithPopup(new firebase.auth.GoogleAuthProvider());
}
async function logout() {
await firebase.auth().signOut();
user = null;
}
async function test() {
console.log('calling test function');
await callableTest();
console.log('returned from test function');
}这些是用于测试的日志，单击pre-login，然后登录..，然后再次测试：
D 2020-02-22T04:08:27.209014265Z test 7whrcrhllsa8 Function execution took 5 ms, finished with status code: 403 test 7whrcrhllsa8
I 2020-02-22T04:08:27.208Z test 7whrcrhllsa8 function test: throwing permission-denied test 7whrcrhllsa8
I 2020-02-22T04:08:27.208Z test 7whrcrhllsa8 function test: start test 7whrcrhllsa8
D 2020-02-22T04:08:27.205019518Z test 7whrcrhllsa8 Function execution started test 7whrcrhllsa8
D 2020-02-22T04:08:27.072797567Z test 7whrdta870ib Function execution took 42 ms, finished with status code: 204 test 7whrdta870ib
D 2020-02-22T04:08:27.031343424Z test 7whrdta870ib Function execution started test 7whrdta870ib
D 2020-02-22T04:07:39.540689974Z test 7whryp7xojaf Function execution took 87 ms, finished with status code: 403 test 7whryp7xojaf 回答 1
Stack Overflow用户
回答已采纳
发布于 2020-02-22 13:42:19
状态代码为204的调用是当请求来自网页(在您的示例中)时CORS pre-flight request的结果。可调用函数会自动处理CORS安全性，因此所有这些都无需您的干预即可实现。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/60349364
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