coderdude on Saved 10 billion DNS queries per month by disabling DNS Prefetching

Comment on Saved 10 billion DNS queries per month by disabling DNS Prefetching

I'm surprised the article doesn't actually tell you the meta http-equiv to disable DNS prefetching. It mentions that it helped out tremendously, though. Here it is:

or, if you're more into HTML5:

buro9 15y

I prefer HTTP headers instead of meta tags where possible.

An example solution at the load balancer level, assuming the use of Varnish:

In vcl_fetch:

  if (req.url ~ "\.(htm|html|php)" || req.url ~ "\/(\?.*)?$") {
    set beresp.http.disable-dns-prefetch = "1";
  }

In vcl_deliver:

  if (resp.http.disable-dns-prefetch) {
    remove resp.http.disable-dns-prefetch;
    set resp.http.X-DNS-Prefetch-Control = "off";
  }

blantonl 15y

do all the browsers that support the meta tag support consuming http headers for this "switch"?

metageek 15y

Http-equiv is just a way of specifying an HTTP header in your HTML, so they really should.

rodion_89 15y

Not closing the tag is nothing specific to HTML5, it just means you aren't strict on XHTML. HTML4 and others would be the same.

coderdude 15y

Well sure, but why does that matter? I could have said "or if you're more into HTML 4.01, 5, and anything before those versions of HTML..."

Pedantic.

rodion_89 15y

I suppose it's just the irritation from the term HTML5 being used in all sorts of inaccurate or misleading ways. What you said wasn't inaccurate, but I feel like throwing in the term HTML5 was unnecessary. But yeah, it's pedantic. It's mostly me being irritated by others.

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