buro9 on Saved 10 billion DNS queries per month by disabling DNS Prefetching

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";
  }

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

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

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