Telegram show description meta tag as link preview. I changed the description meta tag but the link preview of my website didn't changed. How to force telegram to update link preview?
Go to @webpagebot and send the link (up to 10) you want to update. Automatically will scan your site and generate the new image thumbnail, site name and description.
Remember to have og prefix in your html tag as: <html prefix="og: http://ogp.me/ns#"> or telegram bot will not update the graph cache.
You may add /?v=n at the end of URL when sharing the link, where n can be any number and should increase after an update.
Sending the pure link to @webpagebot would not work so I used
<meta property="og:url" content="https://mylink.com" />
and it worked.
来源：https://stackoverflow.com/questions/35268940/how-to-force-telegram-to-update-link-preview