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Initial table size is the maximum permitted when table is first usable #1642

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10 changes: 10 additions & 0 deletions draft-ietf-quic-qpack.md
Original file line number Diff line number Diff line change
Expand Up @@ -127,6 +127,16 @@ The dynamic table consists of a list of header fields maintained in first-in,
first-out order. The dynamic table is initially empty. Entries are added by
instructions on the encoder stream (see {{encoder-stream}}).

The maximum size of the dynamic table can be modified by the encoder, subject to
a decoder-controlled limit (see {{configuration}} and {{size-update}}). The
initial maximum size is determined by the corresponding setting when HTTP
requests or responses are first permitted to be sent. For clients using 0-RTT
data in HTTP/QUIC, the table size is the remembered value of the setting, even
if the server later specifies a larger maximum in its SETTINGS frame. For
HTTP/QUIC servers and HTTP/QUIC clients when 0-RTT is not attempted or is
rejected, the initial maximum table size is the value of the setting in the
peer's SETTINGS frame.

Before a new entry is added to the dynamic table, entries are evicted from the
end of the dynamic table until the size of the dynamic table is less than or
equal to (maximum size - new entry size) or until the table is empty.
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