tree 6ab29db36a1e431d98bca29d8e23771885079452
parent df0b19f907f5f04d1b36e3ebf13e4507ddebf23e
author bnc <bnc@google.com> 1565743625 -0700
committer Copybara-Service <copybara-worker@google.com> 1565885283 -0700

Only send Header Acknowledgement from QpackDecoder if required insert count is not zero.

As prescribed by
https://quicwg.org/base-drafts/draft-ietf-quic-qpack.html#header-acknowledgement.

I have a draft dynamic table encoder CL and a draft round trip fuzzer CL
relaying encoder stream data and decoder stream data between the encoder and
decoder, and I noticed this bug when patching these two CLs together.

gfe-relnote: n/a, change to QUIC v99-only code.  Protected by existing disabled gfe2_reloadable_flag_quic_enable_version_99.
PiperOrigin-RevId: 263253859
Change-Id: I766e4746d7ce88c6214f46d9cb5e35877b1f93e8