Get the source code from Github    -    or the bookmarklet

Result:

https://www.area51central.com/
Array
(
    [date] => Tue, 26 Sep 2023 03:25:54 GMT
    [content-type] => text/html; charset=UTF-8
    [transfer-encoding] => chunked
    [connection] => keep-alive
    [expires] => Wed, 11 Jan 1984 05:00:00 GMT
    [cache-control] => no-cache, must-revalidate, max-age=0
    [x-xss-protection] => 1; mode=block
    [x-content-type-options] => nosniff
    [cf-cache-status] => DYNAMIC
    [report-to] => {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=au%2FYNEtSEM%2BkwDFpboti%2FHvgzVDOnu485jh2PkLKH%2FSKIVLb%2B3UIE8xexQpwsoReQv1yQAIC1QIUe%2Bi8YGYEmeor2qY5ItZq6vK1LlN6da6QO8ToV5gr6lRCS4a54atzwwuz%2BejCGu4%3D"}],"group":"cf-nel","max_age":604800}
    [nel] => {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
    [server] => cloudflare
    [cf-ray] => 80c866e2abf902c9-CDG
    [alt-svc] => h3=":443"; ma=86400
)

Array
(
    [url] => https://www.area51central.com/
    [content_type] => text/html; charset=UTF-8
    [http_code] => 500
    [header_size] => 773
    [request_size] => 123
    [filetime] => -1
    [ssl_verify_result] => 0
    [redirect_count] => 0
    [total_time] => 4.740654
    [namelookup_time] => 0.012425
    [connect_time] => 0.025326
    [pretransfer_time] => 0.062839
    [size_upload] => 0
    [size_download] => 2749
    [speed_download] => 579
    [speed_upload] => 0
    [download_content_length] => -1
    [upload_content_length] => -1
    [starttransfer_time] => 4.740378
    [redirect_time] => 0
    [redirect_url] => 
    [primary_ip] => 172.67.132.163
    [certinfo] => Array
        (
        )

    [primary_port] => 443
    [local_ip] => 78.47.42.177
    [local_port] => 49496
    [http_version] => 2
    [protocol] => 2
    [ssl_verifyresult] => 0
    [scheme] => HTTPS
)

<!DOCTYPE html>
<html lang="en-US">
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<meta name="viewport" content="width=device-width">
		<meta name='robots' content='max-image-preview:large, noindex, follow' />
	<title>WordPress &rsaquo; Error</title>
	<style type="text/css">
		html {
			background: #f1f1f1;
		}
		body {
			background: #fff;
			border: 1px solid #ccd0d4;
			color: #444;
			font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
			margin: 2em auto;
			padding: 1em 2em;
			max-width: 700px;
			-webkit-box-shadow: 0 1px 1px rgba(0, 0, 0, .04);
			box-shadow: 0 1px 1px rgba(0, 0, 0, .04);
		}
		h1 {
			border-bottom: 1px solid #dadada;
			clear: both;
			color: #666;
			font-size: 24px;
			margin: 30px 0 0 0;
			padding: 0;
			padding-bottom: 7px;
		}
		#error-page {
			margin-top: 50px;
		}
		#error-page p,
		#error-page .wp-die-message {
			font-size: 14px;
			line-height: 1.5;
			margin: 25px 0 20px;
		}
		#error-page code {
			font-family: Consolas, Monaco, monospace;
		}
		ul li {
			margin-bottom: 10px;
			font-size: 14px ;
		}
		a {
			color: #0073aa;
		}
		a:hover,
		a:active {
			color: #006799;
		}
		a:focus {
			color: #124964;
			-webkit-box-shadow:
				0 0 0 1px #5b9dd9,
				0 0 2px 1px rgba(30, 140, 190, 0.8);
			box-shadow:
				0 0 0 1px #5b9dd9,
				0 0 2px 1px rgba(30, 140, 190, 0.8);
			outline: none;
		}
		.button {
			background: #f3f5f6;
			border: 1px solid #016087;
			color: #016087;
			display: inline-block;
			text-decoration: none;
			font-size: 13px;
			line-height: 2;
			height: 28px;
			margin: 0;
			padding: 0 10px 1px;
			cursor: pointer;
			-webkit-border-radius: 3px;
			-webkit-appearance: none;
			border-radius: 3px;
			white-space: nowrap;
			-webkit-box-sizing: border-box;
			-moz-box-sizing:    border-box;
			box-sizing:         border-box;

			vertical-align: top;
		}

		.button.button-large {
			line-height: 2.30769231;
			min-height: 32px;
			padding: 0 12px;
		}

		.button:hover,
		.button:focus {
			background: #f1f1f1;
		}

		.button:focus {
			background: #f3f5f6;
			border-color: #007cba;
			-webkit-box-shadow: 0 0 0 1px #007cba;
			box-shadow: 0 0 0 1px #007cba;
			color: #016087;
			outline: 2px solid transparent;
			outline-offset: 0;
		}

		.button:active {
			background: #f3f5f6;
			border-color: #7e8993;
			-webkit-box-shadow: none;
			box-shadow: none;
		}

			</style>
</head>
<body id="error-page">
	<div class="wp-die-message"><p>There has been a critical error on this website.</p><p><a href="https://wordpress.org/documentation/article/faq-troubleshooting/">Learn more about troubleshooting WordPress.</a></p></div></body>
</html>

Fatal error: Uncaught Embed\Exceptions\InvalidUrlException: Invalid url 'https://www.area51central.com/' (Status code 500) 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