When a crawler requests the page, it will receive these Open Graph meta tags. The crawler uses these to generate a link preview.
<meta property="og:type" content="website"> <meta property="twitter:card" content="summary_large_image">
After parsing the meta tags, the crawler will request the image URL. This is what will be displayed in the link preview.
Probes automatically expire after a set time. Once expired, the probe URL will no longer capture requests.