}
				theSocket := tmpFile.Name()
				os.Remove(theSocket)
				tmpFile.Close()

				con, err := net.Listen("unix", theSocket)
				if err != nil {
					t.Fatalf("unexpected error while dialing a socket: %v", err)
				}
				defer con.Close()

				if !isExistingSocket("unix://" + theSocket) {
					t.Fatalf("isExistingSocket(%q) gave unexpected result. Should have been true, instead of false", theSocket)

	// maintains a pool of idle connections for efficient re-use.
	//
	// The provided context.Context is for dialing purposes only
	// (see net.DialContext) and should not be stored or used for
	// other purposes. A default timeout should still be used
	// when dialing as a connection pool may call Connect
	// asynchronously to any query.
	//
	// The returned connection is only used by one goroutine at a

			for _, caCert := range caCerts {
				roots.AddCert(caCert)
			}

			<-startedCh

			// try to dial
			addr := fmt.Sprintf("localhost:%d", secureOptions.BindPort)
			t.Logf("Dialing %s as %q", addr, test.ServerName)
			conn, err := tls.Dial("tcp", addr, &tls.Config{
				RootCAs:    roots,
				ServerName: test.ServerName, // used for SNI in the client HELLO packet
			})
			if err != nil {

	if err != nil {
		return nil, err
	}
	// Issue 18806: if the machine has halfway configured
	// IPv6 such that it can bind on "::" (IPv6unspecified)
	// but not connect back to that same address, fall
	// back to dialing 0.0.0.0.
	if len(ips) == 1 && ips[0].IP.Equal(IPv6unspecified) {
		ips = append(ips, IPAddr{IP: IPv4zero})
	}

	var filter func(IPAddr) bool
	if net != "" && net[len(net)-1] == '4' {
		filter = ipv4only
	}

// Since the Dial to kms-plugin is non-blocking we expect the construction of gRPC service to succeed even when
// kms-plugin is not yet up - dialing happens in the background.
func TestKMSPluginLateStart(t *testing.T) {
	t.Parallel()
	callTimeout := 3 * time.Second
	s := newEndpoint()

	ctx := testContext(t)

// Since the Dial to kms-plugin is non-blocking we expect the construction of gRPC service to succeed even when
// kms-plugin is not yet up - dialing happens in the background.
func TestKMSPluginLateStart(t *testing.T) {
	t.Parallel()
	callTimeout := 3 * time.Second
	s := newEndpoint()

	ctx := testContext(t)

			// but never sent a request). StateNew connections are
			// super rare and have only been seen (in
			// previously-flaky tests) in the case of
			// socket-late-binding races from the http Client
			// dialing this server and then getting an idle
			// connection before the dial completed. There is thus
			// a connected connection in StateNew with no
			// associated Request. We only close StateIdle and

				// See https://www.mailgun.com/blog/http-2-cleartext-h2c-client-example-go/
				// So http2.Transport doesn't complain the URL scheme isn't 'https'
				AllowHTTP: true,
				// Pretend we are dialing a TLS endpoint. (Note, we ignore the passed tls.Config)
				DialTLSContext: func(_ context.Context, network, addr string, _ *tls.Config) (net.Conn, error) {
					return net.Dial(network, addr)
				},
			},
		}

"Arith.Divide".  To invoke one, a client first dials the server:

	client, err := rpc.DialHTTP("tcp", serverAddress + ":1234")
	if err != nil {
		log.Fatal("dialing:", err)
	}

Then it can make a remote call:

	// Synchronous call
	args := &server.Args{7,8}
	var reply int
	err = client.Call("Arith.Multiply", args, &reply)
	if err != nil {

	// DefaultMaxIdleConnsPerHost is used.
	MaxIdleConnsPerHost int

	// MaxConnsPerHost optionally limits the total number of
	// connections per host, including connections in the dialing,
	// active, and idle states. On limit violation, dials will block.
	//
	// Zero means no limit.
	MaxConnsPerHost int

	// IdleConnTimeout is the maximum amount of time an idle