Yup, we can do that too! I didn't mention it in the writeup, but you can also insert <link rel="dns-prefetch" href="http://www.domain.com/&#62 http://www.domain

Yup, we can do that too! I didn't mention it in the writeup, but you can also insert <link rel="dns-prefetch" href="http://www.domain.com/&#62 http://www.domain.com/> hints into the head of the document to tell the browser to pre-resolve certain domains. An often overlooked reason for supporting this is to pre-resolve hostnames behind a redirect. If you have a "http://a.com/resource http://a.com/resource, which redirects to "http://b.com/resource http://b.com/resource, and you know this relationship while you're generating the page, then injecting a dns-prefetch link can help hide the cost of the extra DNS lookup when the browser is following the 3xx.