openssl s_client -connect xx.yyy.zzz:443 -msg
CONNECTED(00000005)
>>> ??? [length 0005]
    16 03 01 01 33
>>> TLS 1.3, Handshake [length 0133], ClientHello
    01 00 01 2f 03 03 5d 97 f2 63 8a 56 f7 eb bf 4d
    97 de c1 3a 9a f7 ad ed 8f ba 0f 32 4e d4 11 e7
    b1 0d 54 86 b1 5a 20 af 07 34 9a 5b 6c 03 6f 89
    ed ae 6a c6 89 15 bf f7 9c 1e 5f f9 a4 9f 05 39
    17 90 eb 5f 7a 90 69 00 3e 13 02 13 03 13 01 c0
    2c c0 30 00 9f cc a9 cc a8 cc aa c0 2b c0 2f 00
    9e c0 24 c0 28 00 6b c0 23 c0 27 00 67 c0 0a c0
    14 00 39 c0 09 c0 13 00 33 00 9d 00 9c 00 3d 00
    3c 00 35 00 2f 00 ff 01 00 00 a8 00 00 00 0f 00
    0d 00 00 0a 6a 35 2e 6d 6f 6e 2e 72 6f 63 00 0b
    00 04 03 00 01 02 00 0a 00 0c 00 0a 00 1d 00 17
    00 1e 00 19 00 18 00 23 00 00 00 16 00 00 00 17
    00 00 00 0d 00 30 00 2e 04 03 05 03 06 03 08 07
    08 08 08 09 08 0a 08 0b 08 04 08 05 08 06 04 01
    05 01 06 01 03 03 02 03 03 01 02 01 03 02 02 02
    04 02 05 02 06 02 00 2b 00 09 08 03 04 03 03 03
    02 03 01 00 2d 00 02 01 01 00 33 00 26 00 24 00
    1d 00 20 18 1a 11 ec 31 e8 a3 e1 7a 87 32 11 16
    1d e0 fd 0b 98 50 04 44 96 f9 c1 85 40 0e 66 a4
    73 eb 71
<<< ??? [length 0005]
    48 54 54 50 2f
140597649375680:error:1408F10B:SSL routines:ssl3_get_record:wrong version number:../ssl/record/ssl3_record.c:332:
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 5 bytes and written 312 bytes
Verification: OK
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---