Linux strace of capture-owned desktop backend PID 2929877, FD7 host commands / FD6 host replies. Only cookie/cache command IDs retained.
2929888 12:09:32.917423 write(7, "{\"type\":\"cdp\",\"threadId\":\"28833b0c-8a4a-4fa7-af68-267af4e6cd4c\",\"tabId\":\"tab_3_d045bb44-0400-4dd4-9dfc-bbc9fd78350a\",\"message\":\"{\\\"id\\\":24,\\\"method\\\":\\\"Network.clearBrowserCache\\\",\\\"sessionId\\\":\\\"t3-preview-page-2\\\"}\"}\n", 219) = 219
2929877 12:09:32.924616 read(6, "{\"type\":\"cdp\",\"threadId\":\"28833b0c-8a4a-4fa7-af68-267af4e6cd4c\",\"tabId\":\"tab_3_d045bb44-0400-4dd4-9dfc-bbc9fd78350a\",\"message\":\"{\\\"id\\\":24,\\\"result\\\":{},\\\"sessionId\\\":\\\"t3-preview-page-2\\\"}\"}\n", 65536) = 192
2929890 12:09:37.444604 write(7, "{\"type\":\"cdp\",\"threadId\":\"28833b0c-8a4a-4fa7-af68-267af4e6cd4c\",\"tabId\":\"tab_3_d045bb44-0400-4dd4-9dfc-bbc9fd78350a\",\"message\":\"{\\\"id\\\":29,\\\"method\\\":\\\"Network.clearBrowserCookies\\\",\\\"sessionId\\\":\\\"t3-preview-page-2\\\"}\"}\n", 221) = 221
2929877 12:09:37.450035 read(6, "{\"type\":\"cdp\",\"threadId\":\"28833b0c-8a4a-4fa7-af68-267af4e6cd4c\",\"tabId\":\"tab_3_d045bb44-0400-4dd4-9dfc-bbc9fd78350a\",\"message\":\"{\\\"id\\\":29,\\\"result\\\":{},\\\"sessionId\\\":\\\"t3-preview-page-2\\\"}\"}\n", 65536) = 192