為什麼要引入伺服器端渲染優化？
Without SSR optimization, it is possible for the following to occur:
Pages do not render quickly enough, which leads to SSR using too much memory, and eventually it fails.
如果頁面渲染不夠快，可能會導緻 SSR 使用了太多記憶體，最終導緻渲染失敗；
A response is not received in time, and an HTTP 500 error is returned.
無法按時接收到響應，隻得傳回 HTTP 500 錯誤給用戶端。
SSR 優化引擎的參數
timeout
a number that indicates the amount of time (in milliseconds) during which the SSR server tries to render a page, before falling back to CSR.
該配置的機關是毫秒，代表 SSR 伺服器在退化到使用用戶端渲染之前，能夠消耗用于渲染頁面的時間。如果過了這個時間間隔，還未完成伺服器端渲染，則傳回 CSR 的 index.html 給用戶端。該 index.html 不包含任何渲染好的 markup.