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I’m having some issues to debug this in php. When I include this line:
require_once("http://" . $_SERVER["HTTP_HOST"] . "/dompdf/dompdf_config.inc.php");
what I get is just a blank page, I don’t get any html code as response. Maybe the error messages are hidden ?
You should not require/include a remote file like this. Instead provide the local absolute or relative path.
Though insecure and not recommended, it is technically possible to do if certain configuration options are set. (allow_url_include)
See other answers below regarding display_errors for future debugging concerns. I often use the PHP command line interpreter to get the real error, without allowing error details to be presented to web visitors.