I believe they're doing a meta-tag redirect (possibly inside a noscript tag?) in at least some cases. Source: I'm developing a web engine that doesn't have JS support.
<!DOCTYPE html>
<html>
<head><title>Google Search</title>...</head>
<body>
<noscript>
<meta content="0;url=/httpservice/retry/enablejs?sei=..." http-equiv="refresh">
<div style="display:block">Please click <a href="/httpservice/retry/enablejs?sei=...">here</a> if you are not redirected within a few seconds.</div>
</noscript>... <noscript><meta content="0;url=/httpservice/retry/enablejs?sei=a3qIZ42cGcvcp84P5p_mwQI" http-equiv="refresh"><style>table,div,span,p{display:none}</style><div style="display:block">Please click <a href="/httpservice/retry/enablejs?sei=a3qIZ42cGcvcp84P5p_mwQI">here</a> if you are not redirected within a few seconds.</div></noscript></header> var remover = {
init: function() {
var appcontent = document.getElementById("appcontent");
if(appcontent) {
appcontent.addEventListener("DOMContentLoaded",
function(e) {
var doc = e.originalTarget;
if(doc instanceof HTMLDocument) {
var noscripts = doc.getElementsByTagName('noscript');
for(var i = 0; i < noscripts.length; i++) {
//if(noscripts[i].innerHTML.indexOf('meta content="0;url=/httpservice/retry/enablejs?sei=') != -1) {
noscripts[i].parentNode.removeChild(noscripts[i]);
//}
}
}
}, true);
}
}
};window.addEventListener("load", function() { remover.init(); }, false);
It’s a blank page with one line of text: “Please click here if you are not redirected within a few seconds”.