https://firebase.google.com/docs/hosting/manage-cache?hl=zh-cn#using_cookies 将 Firebase 托管与 Cloud Functions 或 Cloud Run 搭配使用时，Cookie 通常会从传入的请求中剥离出来。这是实现高效的 CDN 缓存行为所必需的。只有特别指定的 __session Cookie 可以传入应用执行过程中。 __session Cookie（如果存在）会自动成为缓存键的一部分，也就是说，使用不同 Cookie 的两个用户绝不会收到彼此的已缓存响应。只有在您的应用根据用户授权提供不同的内容时，您才能使用 __session Cookie。

System on firebase functions always have problems that code start. https://medium.com/@siriwatknp/cold-start-workaround-in-firebase-cloud-functions-8e9db1426bd3 So google office https://firebase.google.com/docs/functions/networking const http = require('http'); const functions = require('firebase-functions'); // Setting the `keepAlive` option to `true` keeps // connections open between function invocations const agent = new http.Agent({keepAlive: true}); exports.function = functions.https.onRequest((request, response) => { req = http.request({ host: '', port: 80, path: '', method: 'GET', agent: agent, // Holds the connection open after the first invocation }, res => { let rawData = ''; res.setEncoding('utf8'); res.on('data', chunk => { rawData += chunk; }); ... Two line let me confused. Not only me. const agent = new http.Agent({keepAlive: true}); agent: agent, // Holds the connection open after the first invocation Some guy same me. ...

新增說明文字 https://www.youtube.com/watch?v=MgLc95nBeNE [ ](https://www.youtube.com/watch?v=MgLc95nBeNE)

最近寫mysql 發現 原來 mysql 在json內容時，也有支援一些操作 https://www.cnblogs.com/chuanzhang053/p/9139624.html https://medium.com/micheh/%E5%9C%A8-mysql-%E4%BD%BF%E7%94%A8-json-5796a65701ad 再加上 mysql 還有另一個譆能 虛疑欄位 GENERATED ALWAYS AS http://blog.changyy.org/2017/09/mysql-json-mysql-57.html 基本上可以把json內的某欄位值當成 virutal colume, 直接輸出 覺得這樣可以玩出很多變化 https://www.cnblogs.com/waterystone/p/5626098.html

For logging mulit args with “%O”``` const util = require(‘util’); function d(…args) { if (typeof (console) !== ‘undefined’) { console.log(’[Logging]’, util.format(…args)); } }