We have a process that converts xml to html via a XSLT file. We are using css from the same website that is using the process.
<head>
<link href="$siteURL/css/pdf.css" rel="stylesheet" type="text/css"></link>
</head>
This worked when the server was Windows Server 2012 R2, but does not work since upgrading to Windows Server 2019.
If I change the link href to the absolute path, then the css is read correctly and the html file has the correct style.
When I changed to the absolute path, everything works correctly.