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Result:

http://kaesegeneral.at/wp-content/uploads/2017/10/gluecksspiel/magic-target-freispiele.html
Array
(
    [date] => Fri, 10 Apr 2020 19:46:52 GMT
    [server] => Apache
    [content-length] => 331
    [connection] => close
    [content-type] => text/html; charset=iso-8859-1
)
Array
(
    [url] => http://kaesegeneral.at/wp-content/uploads/2017/10/gluecksspiel/magic-target-freispiele.html
    [content_type] => text/html; charset=iso-8859-1
    [http_code] => 404
    [header_size] => 164
    [request_size] => 185
    [filetime] => -1
    [ssl_verify_result] => 0
    [redirect_count] => 0
    [total_time] => 0.010782
    [namelookup_time] => 0.004362
    [connect_time] => 0.005187
    [pretransfer_time] => 0.00535
    [size_upload] => 0
    [size_download] => 331
    [speed_download] => 33100
    [speed_upload] => 0
    [download_content_length] => 331
    [upload_content_length] => -1
    [starttransfer_time] => 0.010665
    [redirect_time] => 0
    [redirect_url] => 
    [primary_ip] => 213.133.100.42
    [certinfo] => Array
        (
        )

    [primary_port] => 80
    [local_ip] => 78.47.42.177
    [local_port] => 51422
    [http_version] => 2
    [protocol] => 1
    [ssl_verifyresult] => 0
    [scheme] => HTTP
)
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL /wp-content/uploads/2017/10/gluecksspiel/magic-target-freispiele.html was not found on this server.</p>
<hr>
<address>Apache Server at kaesegeneral.at Port 80</address>
</body></html>

Fatal error: Uncaught Embed\Exceptions\InvalidUrlException: Invalid url 'http://kaesegeneral.at/wp-content/uploads/2017/10/gluecksspiel/magic-target-freispiele.html' (Status code 404) in /var/www/oscarotero.com/www/embed3/src/Embed.php:142 Stack trace: #0 /var/www/oscarotero.com/www/embed3/src/Embed.php(81): Embed\Embed::process() #1 /var/www/oscarotero.com/www/embed3/demo/index.php(216): Embed\Embed::create() #2 {main} thrown in /var/www/oscarotero.com/www/embed3/src/Embed.php on line 142