Question

这是我调用的功能

'use strict';

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
const express = require('express');
const cors = require('cors')({origin: true});
const router = new express.Router();

 router.use(cors);  
 router.get('*', (req, res) => {
      res.setHeader('Access-Control-Allow-Origin', '*').status(200)
            .send('Hello, Functions');
    });

exports.date = functions.https.onRequest(router);

但是我收到了这个错误：

XMLHttpRequest无法加载 https://us-central1-idntt-baed5.cloudfunctions.net/date。没有＆＃39;访问控制允许来源＆＃39;标题出现在请求的上资源。起源＆＃39; https://idntt-baed5.firebaseapp.com＆＃39;因此不允许访问。响应的HTTP状态代码为500。

Answer 1

您正在尝试执行的操作的正确代码是：

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

// Start writing Firebase Functions
// https://firebase.google.com/functions/write-firebase-functions

exports.date = functions.https.onRequest((request, response) => {
    response.send("Hello, Functions");
})

现在你应该喜欢这个https://us-central1-idntt-baed5.cloudfunctions.net/date。

并且您不允许使用Access-Control-Allow-Origin

Answer 2

您正在尝试执行的操作的正确代码是：

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.date = functions.https.onRequest((request, response) => {
    response.send("Hello, Functions");
})

可能会产生这样的错误，

XMLHttpRequest cannot load https://us-central1-idntt-baed5.cloudfunctions.net/date. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://idntt-baed5.firebaseapp.com' is therefore not allowed access. The response had HTTP status code 500.

请在 xhr 请求

中使用此标头

req.setRequestHeader('Access-Control-Allow-Origin', '*');

尝试在mozilla firefox中运行，由于安全问题，Google Chrome不支持此功能

Answer 3

如果您通过firebase中托管的站点/页面请求该功能，则您（firebase hosting）应添加重写规则。 Firebase文档中对此进行了解释：https://firebase.google.com/docs/hosting/functions#directing_hosting_requests_to_your_function

用于firebase返回响应的云函数500

3 个答案: