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Only ack headers that have non-zero declared Largest Reference #1605

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merged 1 commit into from Aug 2, 2018
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Only ack headers that have non-zero declared Largest Reference #1605

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10 changes: 5 additions & 5 deletions draft-ietf-quic-qpack.md
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Expand Up @@ -573,11 +573,11 @@ before using it.

### Header Acknowledgement

After processing a header block on a request or push stream, the decoder emits a
Header Acknowledgement instruction on the decoder stream. The instruction
begins with the '1' one-bit pattern and includes the request stream's stream ID,
encoded as a 7-bit prefix integer. It is used by the peer's QPACK encoder to
know when it is safe to evict an entry.
After processing a header block whose declared Largest Reference is not zero,
the decoder emits a Header Acknowledgement instruction on the decoder stream.
The instruction begins with the '1' one-bit pattern and includes the request
stream's stream ID, encoded as a 7-bit prefix integer. It is used by the
peer's QPACK encoder to know when it is safe to evict an entry.

The same Stream ID can be identified multiple times, as multiple header blocks
can be sent on a single stream in the case of intermediate responses, trailers,
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