<p>I am using Dialer.Dial from package net to make a tcp connection. Currently i can measure the time it takes to make the connection like so :-</p>
<pre><code>start := time.Now()
dialer := &net.Dialer{ }
con, err := dialer.Dial("tcp", "example.com:80")
log.Println("dial time: ", time.since(start))
</code></pre>
<p>This gives me the total time to establish the connection which includes DNS and tcp connect. I would like to know the DNS lookup time and connect time separately...</p>
<p>So far the options I see are...</p>
<ol>
<li>Resolve the hostname by hand, and feed one of the ip into Dial - but here I loose fallback and dualstack strategy provided inside Dialer.Dial</li>
<li>Recreate the whole logic in my code - But this is too much work and I am lazy. Reproducing things from standard library sounds like not a good thing.</li>
</ol>
<p>The first thing <a href="https://golang.org/src/net/dial.go?s=6061:6121#L197">Dialer.Dial</a> does is :-</p>
<pre><code>addrs, err := resolveAddrList("dial", network, address, finalDeadline)
</code></pre>
<p>Is there a way to either time that step? Or be able to provide a list of addrs to Dial instead of single hostname/IP?</p>
<p>Looking for an easier way out.</p>
<p>PS: My code where I need to implement inside <a href="https://github.com/turbobytes/pulse/blob/master/utils/curl.go#L77">func dial</a></p>
<hr/>**评论：**<br/><br/>bradfitz: <pre><p>File a feature request bug.</p></pre>sajal: <pre><p>Thanks. Done
<a href="https://github.com/golang/go/issues/12476" rel="nofollow">https://github.com/golang/go/issues/12476</a></p></pre>
