Intermittent 404s (openresty and /z urls)

Hello Cloudflare,

We have been having these strange issues recently whereby visitors are redirected to an empty “404 Not Found - openresty” page, and the URL is like /z0f76a1d14fd21a8fb5fd0d03e0fdc3d3cedae52fwsidchk=6864647

This happens from time to time - let’s say every other day - with no particular action on our side. Any hints?

Many thanks,
Adicco

Just to clarify: this seems to happen after getting a brief “Please wait while your request is being verified…”

curl https://amaravati.org
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="robots" content="noindex, nofollow">
<title>One moment, please...</title>
<style>
body {
    background: #F6F7F8;
    color: #303131;
    font-family: sans-serif;
    margin-top: 45vh;
    text-align: center;
}
</style>
</head>
<body>
<h1>Please wait while your request is being verified...</h1>
<form id="wsidchk-form" style="display:none;" action="/z0f76a1d14fd21a8fb5fd0d03e0fdc3d3cedae52f" method="get">
<input type="hidden" id="wsidchk" name="wsidchk"/>
</form>
<script>
(function(){
    var west=+((+!+[]+!![]+!![]+!![]+!![]+!![]+!![])+(+!+[]+!![]+!![]+!![]+!![]+!![]+[])+(+!+[]+!![]+!![])+(+!+[]+!![]+!![]+!![]+!![]+[])+(+!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![])+(+!+[]+[])),
        east=+((+!+[]+!![]+!![]+!![]+!![]+!![])+(+!+[]+[])+(+![])+(+!+[]+[])+(+![])+(+!+[]+!![]+!![]+!![]+!![]+!![]+[])+(+!+[]+!![]+!![]+!![]+!![]+!![])),
        x=function(){try{return !!window.addEventListener;}catch(e){return !!0;} },
        y=function(y,z){x() ? document.addEventListener("DOMContentLoaded",y,z) : document.attachEvent("onreadystatechange",y);};
    y(function(){
        document.getElementById('wsidchk').value = west + east;
        document.getElementById('wsidchk-form').submit();
    }, false);
})();
</script>
</body>
</html>% 

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