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Open graph thumbnail not always showing

17 February 2021

Although many online examples mention and use site relative paths, Signal and possibly Telegram expect a full URL for the og:image tag.

<meta property="og:url" content="https://some.domain"/>
<meta property="og:title" content="title"/>
<meta property="og:description" content="description">
<meta property="og:image" content="https://some.domain/favimage-480x270.jpg">
<meta property="og:type" content="website"/>
<meta property="og:locale" content="en_GB"/>