[openssl-users] Double TLS 1.3 session ticket?

[Yann Ylavic]

On Wed, Jun 20, 2018 at 8:59 PM, Viktor Dukhovni
<openssl-users at dukhovni.org> wrote:
>
>
>> On Jun 20, 2018, at 2:55 PM, Yann Ylavic <ylavic.dev at gmail.com> wrote:
>>
>> Hi,
>>
>> connecting s_client to s_server with TLS 1.3 seems to cause two
>> successive session tickets to be sent by the server (see below).
>>
>> Is this expected?
>
> Yes.

Thanks, it does not happen with mozzilla implementation
(tls13.crypto.mozilla.org), is this openssl specific or part of the
specification?

Also, since there does not seem to be a round trip in between, any
reason to flush the BIO/socket?