It says that the server sends an image with certain dimensions back as an error code, so I wonder what you could do if you served some simple HTML that uses the

It says that the server sends an image with certain dimensions back as an error code, so I wonder what you could do if you served some simple HTML that uses the local server as a meta tag that renders in the preview? I imagine slack would do that on the client since it’s built on electron. Unless it requires more than loading a URL.