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Update draft-ietf-quic-recovery.md
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ianswett committed Jul 14, 2020
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7 changes: 3 additions & 4 deletions draft-ietf-quic-recovery.md
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Expand Up @@ -642,10 +642,9 @@ packet number to eliminate the ack delay.

When the PTO timer expires, an ack-eliciting packet MUST be sent. An endpoint
SHOULD include new data in this packet. Previously sent data MAY be sent if
no new data can be sent. Implementations MAY use
alternative strategies for determining the content of probe packets,
including sending new or retransmitted data based on the application's
priorities.
no new data can be sent. Implementations MAY use alternative strategies for
determining the content of probe packets, including sending new or
retransmitted data based on the application's priorities.

It is possible the sender has no new or previously-sent data to send.
As an example, consider the following sequence of events: new application data
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