@@ -108,6 +108,19 @@ func NewClient(host string, version string, client *http.Client, httpHeaders map

 	}, nil

 }

+// Close ensures that transport.Client is closed

+// especially needed while using NewClient with *http.Client = nil

+// for example

+// client.NewClient("unix:///var/run/docker.sock", nil, "v1.18", map[string]string{"User-Agent": "engine-api-cli-1.0"})

+func (cli *Client) Close() error {

+

+	if t, ok := cli.client.Transport.(*http.Transport); ok {

+		t.CloseIdleConnections()

+	}

+

+	return nil

+}

+

 // getAPIPath returns the versioned request path to call the api.

 // It appends the query parameters to the path if they are not empty.

 func (cli *Client) getAPIPath(p string, query url.Values) string {

@@ -133,6 +133,11 @@ func TestGetAPIPath(t *testing.T) {

 		if g != cs.e {

 			t.Fatalf("Expected %s, got %s", cs.e, g)

 		}

+

+		err = c.Close()

+		if nil != err {

+			t.Fatalf("close client failed, error message: %s", err)

+		}

 	}

 }