Currently this library unconditionally invokes the httptrace.ClientTrace GotConn callback after dialing.

However, the documentation from httptrace specifically states that it will only be called after a successful dial. https://pkg.go.dev/net/http/httptrace#ClientTrace

	// GotConn is called after a successful connection is
	// obtained. There is no hook for failure to obtain a
	// connection; instead, use the error from
	// Transport.RoundTrip.
	GotConn func(GotConnInfo)

Consequently, this library should do the error check first.