What's inside net/http: Late binding in the Go standard library

So if there are idle connections in the pool, and a client asks for a connection, the library still tries to open a new connection?

And when it gets the pooled connection a few cycles later, it marks the new connection that is still being opened to be 'given away', which presumably means added to the pool?

Am I missing something?

Reading the standard library is a huge help in learning to write Go well. It's a high-quality compendium of best practices.