Get the source code from Github    -    or the bookmarklet

Result:

https://www.markusleiter.com/2018/09/01/chloroquine-covid-19-tabletki-najtaniej-bez-recepty-bieru-324/
Array
(
    [date] => Fri, 04 Dec 2020 13:58:06 GMT
    [server] => Apache
    [www-authenticate] => Basic realm="Authentication required"
    [content-length] => 381
    [content-type] => text/html; charset=iso-8859-1
)
Array
(
    [url] => https://www.markusleiter.com/2018/09/01/chloroquine-covid-19-tabletki-najtaniej-bez-recepty-bieru-324/
    [content_type] => text/html; charset=iso-8859-1
    [http_code] => 401
    [header_size] => 205
    [request_size] => 195
    [filetime] => -1
    [ssl_verify_result] => 0
    [redirect_count] => 0
    [total_time] => 0.076114
    [namelookup_time] => 0.028543
    [connect_time] => 0.03779
    [pretransfer_time] => 0.066002
    [size_upload] => 0
    [size_download] => 381
    [speed_download] => 5013
    [speed_upload] => 0
    [download_content_length] => 381
    [upload_content_length] => -1
    [starttransfer_time] => 0.075942
    [redirect_time] => 0
    [redirect_url] => 
    [primary_ip] => 217.26.52.224
    [certinfo] => Array
        (
        )

    [primary_port] => 443
    [local_ip] => 78.47.42.177
    [local_port] => 60938
    [http_version] => 2
    [protocol] => 2
    [ssl_verifyresult] => 0
    [scheme] => HTTPS
)
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>401 Unauthorized</title>
</head><body>
<h1>Unauthorized</h1>
<p>This server could not verify that you
are authorized to access the document
requested.  Either you supplied the wrong
credentials (e.g., bad password), or your
browser doesn't understand how to supply
the credentials required.</p>
</body></html>

Fatal error: Uncaught Embed\Exceptions\InvalidUrlException: Invalid url 'https://www.markusleiter.com/2018/09/01/chloroquine-covid-19-tabletki-najtaniej-bez-recepty-bieru-324/' (Status code 401) 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