fix https

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)

api/client/cli.go

@@ -65,8 +65,13 @@ func NewDockerCli(in io.ReadCloser, out, err io.Writer, proto, addr string, tlsC
 	var (
 		isTerminal = false
 		terminalFd uintptr
+		scheme     = "http"
 	)
 
+	if tlsConfig != nil {
+		scheme = "https"
+	}
+
 	if in != nil {
 		if file, ok := in.(*os.File); ok {
 			terminalFd = file.Fd()
@@ -86,6 +91,7 @@ func NewDockerCli(in io.ReadCloser, out, err io.Writer, proto, addr string, tlsC
 		isTerminal: isTerminal,
 		terminalFd: terminalFd,
 		tlsConfig:  tlsConfig,
+		scheme:     scheme,
 	}
 }
 
@@ -99,4 +105,5 @@ type DockerCli struct {
 	isTerminal bool
 	terminalFd uintptr
 	tlsConfig  *tls.Config
+	scheme     string
 }