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http - How do you test the effects of dns-prefetch and preconnect

I'm trying out the <link rel="dns-prefetch"> and <link rel="preconnect"> tags and I'm trying to see whether they help for my site. I can't find any online resources about how verify if these hints are working using browser dev tools, extensions, or other software. It seems like you just evaluate whether they may be useful to you based on some criteria and then drop them in and hope for the best.

In my case, I have a single page app that renders the entire contents of the <body> in the browser, so the browser can't really scan the initial HTML to lookahead for domains to resolve so it seemed like this might be useful for me.

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Run your page through webpagetest.org. Requests to the domains you specified in your dns-prefetch or preconnect tags should begin sooner because the initial connection will have been established.

This will show in the waterfall graph, for those requests - at the left of the bar the DNS, connect and SSL (if applicable) segments will detach from the response and move to the left in the waterfall, to reflect the fact that they occurred earlier.


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