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Remove redundant sentence about PTO response #4728

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Jan 12, 2021
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Remove redundant sentence about PTO response #4728

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10 changes: 5 additions & 5 deletions draft-ietf-quic-recovery.md
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Expand Up @@ -716,11 +716,11 @@ spaces.
If the sender wants to elicit a faster acknowledgment on PTO, it can skip a
packet number to eliminate the acknowledgment 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.
An endpoint SHOULD include new data in packets that are sent on PTO expiration.
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.

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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