Looks like you don't know your own system.
Downloading
http://www.spinsjoy-lp.com/.well-known/acme-challenge/1234
there is something with an iframe and a JavaScript.
<html style="height:100%"><head><META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">
<meta name="format-detection" content="telephone=no"><meta name="viewport" content="initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<script type="text/javascript" src="/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3"></script></head>
<body style="margin:0px;height:100%">
<iframe id="main-iframe" src="/_Incapsula_Resource?CWUDNSAI=20&xinfo=13-283075958-0%20NNNN%20RT%281617091540176%200%29%20q%280%20-1%20-1%200%29%20r%280%20-1%29%20B10%2814%2c0%2c0%29%20U18&incident_id=730000360308573455-955972240243558669&edet=10&cinfo=0e0000008e27&rpinfo=0" frameborder=0 width="100%" height="100%" marginheight="0px" marginwidth="0px">Request unsuccessful. Incapsula incident ID: 730000360308573455-955972240243558669</iframe>
</body></html>
The browser executes the JavaScript and redirects to a 404 page.