Get the source code from Github    -    or the bookmarklet

Result:

https://tantso.com/
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    [cache-control] => private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
    [expires] => Thu, 01 Jan 1970 00:00:01 GMT
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    [report-to] => {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=JNoW8SJcv2HhhSQCRV8VcXOW%2FMZURfJXrqlXAWoXCBrAZDOb8FQI8kTPcS5ViZxlY%2Fe7sGC5F56ODfcnF551AcIVYet3QLcJPZGH%2B2BS2hG4w9qvthQLssES3LXS"}],"group":"cf-nel","max_age":604800}
    [nel] => {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
    [vary] => Accept-Encoding
    [strict-transport-security] => max-age=31536000; includeSubDomains; preload
    [x-content-type-options] => nosniff
    [server] => cloudflare
    [cf-ray] => 73c9cf874ae577f7-VIE
    [alt-svc] => h3=":443"; ma=86400, h3-29=":443"; ma=86400
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    [content_type] => text/html; charset=UTF-8
    [http_code] => 503
    [header_size] => 1272
    [request_size] => 112
    [filetime] => -1
    [ssl_verify_result] => 0
    [redirect_count] => 0
    [total_time] => 0.084832
    [namelookup_time] => 0.02859
    [connect_time] => 0.038315
    [pretransfer_time] => 0.064664
    [size_upload] => 0
    [size_download] => 7867
    [speed_download] => 93654
    [speed_upload] => 0
    [download_content_length] => -1
    [upload_content_length] => -1
    [starttransfer_time] => 0.084594
    [redirect_time] => 0
    [redirect_url] => 
    [primary_ip] => 104.21.52.43
    [certinfo] => Array
        (
        )

    [primary_port] => 443
    [local_ip] => 78.47.42.177
    [local_port] => 52206
    [http_version] => 2
    [protocol] => 2
    [ssl_verifyresult] => 0
    [scheme] => HTTPS
)

<!DOCTYPE html>
<html lang="en-US">
<head>
    <title>Just a moment...</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=Edge" />
    <meta name="robots" content="noindex,nofollow" />
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</head>
<body class="no-js">
    <div class="main-wrapper" role="main">
    <div class="main-content">
        <h1 class="zone-name-title h1">
            <img class="heading-favicon" src="/favicon.ico"
                 onerror="this.onerror=null;this.parentNode.removeChild(this)" />
            tantso.com
        </h1>
        <h2 class="h2" id="cf-challenge-running">
            Checking if the site connection is secure
        </h2>
        <noscript>
            <div id="cf-challenge-error-title">
                <div class="h2">
                    <span class="icon-wrapper">
                        <div class="heading-icon warning-icon"></div>
                    </span>
                    <span id="cf-challenge-error-text">
                        Enable JavaScript and cookies to continue
                    </span>
                </div>
            </div>
        </noscript>
        <div id="trk_jschal_js" style="display:none;background-image:url('/cdn-cgi/images/trace/jsch/nojs/transparent.gif?ray=73c9cf874ae577f7')"></div>
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            tantso.com needs to review the security of your connection before
            proceeding.
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    <div class="footer" role="contentinfo">
        <div class="footer-inner">
            <div class="clearfix diagnostic-wrapper">
                <div class="ray-id">Ray ID: <code>73c9cf874ae577f7</code></div>
            </div>
            <div class="text-center">
                Performance &amp; security by
                <a rel="noopener noreferrer" href="https://www.cloudflare.com?utm_source=challenge&utm_campaign=j" target="_blank">Cloudflare</a>
            </div>
        </div>
    </div>
</body>
</html>

Fatal error: Uncaught Embed\Exceptions\InvalidUrlException: Invalid url 'https:///tantso.com/' (Status code 503) 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