Dns prefetching with javascript

Question

I'm changing the dns-prefetching href with javascript. I want to know if it is effective. I'have 2 website that share the same javascript.

So i do something like this:

<link id="prefetching" href="//www.site1.com" rel="dns-prefetch" />




var currentDomain = document.domain;

if (currentDomain.contains("site1")) {
    $("prefetching").href = currentDomain.replace("site1", "site2");
    return;
}
if (currentDomain.contains("site2")) {
    $("prefetching").href = currentDomain.replace("site2", "site1");
    return;
}

teezee · Accepted Answer · 2013-12-11 19:56:49Z

0

It wouldn't hurt to dns-prefetch both domains, simply by adding two <link rel="dns-prefetch"> tags.

Waiting for the javascript to be run, before being able to interpret the (changed) dns-prefetch tags in the <head> of your document would undo the kind of improvement you're after.

Nonetheless, if you do want to find out if your method is working, in Chrome you can see the DNS-prefetching info by opening chrome://dns/ in the address bar.

answered Dec 11, 2013 at 19:56

teezee

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