Test to img on my site

[Thomas Klemm]

I assume that you are using Chrome.
In the Console of the Developer Tools I get the following warning:

Quote:Mixed Content: The page at 'https://www.hpmuseum.org/forum/newreply.php?tid=22108' was loaded over HTTPS, but requested an insecure element 'http://www.jeffcalc.hp41.eu/hpil/index_fichiers/image006.jpg'. This request was automatically upgraded to HTTPS, For more information see https://blog.chromium.org/2019/10/no-mor...https.html

But then an error:

Quote:Failed to load resource: net::ERR_CERT_COMMON_NAME_INVALID image006.jpg:1

You can explicitly mark your site as secure.
In chrome://flags search for "Insecure origins treated as secure", enable it and add your domain.
But this works now only for you.

You could use Let's Encrypt to provide https to your site.

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BTW: Safari shows the linked images.