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;
}
1 answers
solution1
0 2013-12-11 19:56:49
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.
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