为什么 Open Graph 检查器无法检测到 Open Graph 数据？

Question

My page, after adding an SSL certificate (Let's Encrypt), cannot have preview fetched by Facebook or Twitter when sharing the link. I have followed The Open Graph protocol 并包含以下开放图标签：

<meta property="og:type" content="article" />
<meta property="og:title" content="Corner Timer: gently make you feel guilty on time-wasting apps" />
<meta property="og:url" content="https://lyminhnhat.com/resources/productivity/corner-timer-gently-make-you-feel-guilty-on-time-wasting-apps/" />
<meta property="og:description" content="Make you feel guilty for your unproductive curiosity" />
<meta name="twitter:site" content="@ooker777" />
<meta name="twitter:text:title" content="Corner Timer: gently make you feel guilty on time-wasting apps" />
<meta name="twitter:image" content="https://lyminhnhat.com/wp-content/uploads/2019/04/Screenshot_2019-04-11-11-31-39.png?w=640" />
<meta name="twitter:card" content="summary_large_image" />

但是，我使用的所有 3 个 Open Graph 检查器 - OpenGraphCheck.com, Abhinay Rathore's Open Graph Tester, Facebook's Object Debugger - say that there is no Open Graph implement. There is one exception though: Iframely's Embed Codes

由于所有三个检查器都对此有问题，可能这不仅仅是 Facebook 的问题，正如中所建议的那样。然而，即使我尝试仅使用 html 链接，使用 <html prefix="og: http://ogp.me/ns#"> 剥离结束白色 space，也没有任何变化。

This person 表明这可能是服务器问题。你知道为什么会这样吗？

^{相关：Would having a fresh website with SSL already avoid Open Graph problem?}

Answer 1

就我而言，爬虫似乎只是有一个错误。我在这个问题上有自己的规范答案，希望对某人有所帮助：

为什么 Open Graph 检查器无法检测到 Open Graph 数据？

Why can't Open Graph checkers detect Open Graph data?

meta

url

ssl-certificate

facebook-opengraph