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martinthomson committed Oct 10, 2017
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19 changes: 9 additions & 10 deletions draft-ietf-quic-transport.md
Expand Up @@ -2759,16 +2759,15 @@ ordered byte-stream. Data received out of order MUST be buffered for later
delivery, as long as it is not in violation of the receiver's flow control
limits.
An endpoint MUST NOT send data on any stream without ensuring that it
is within the data limits set by its peer. The cryptographic
handshake stream, Stream 0, is exempt from the connection-level data
limits established by MAX_DATA. Data on stream 0 other than the
initial cryptographic handshake message is still subject to stream-level data limits and
MAX_STREAM_DATA. The TLS ClientHello is exempt from flow control because it needs
to be sent in a single packet regardless of the server's flow control
state. This rule applies even for 0-RTT handshakes where the
remembered value of MAX_STREAM_DATA would not permit sending
a full initial cryptographic handshake message.
An endpoint MUST NOT send data on any stream without ensuring that it is within
the data limits set by its peer. The cryptographic handshake stream, Stream 0,
is exempt from the connection-level data limits established by MAX_DATA. Data on
stream 0 other than the initial cryptographic handshake message is still subject
to stream-level data limits and MAX_STREAM_DATA. The TLS ClientHello is exempt
from flow control because it needs to be sent in a single packet regardless of
the server's flow control state. This rule applies even for 0-RTT handshakes
where the remembered value of MAX_STREAM_DATA would not permit sending a full
initial cryptographic handshake message.
Flow control is described in detail in {{flow-control}}, and congestion control
is described in the companion document {{QUIC-RECOVERY}}.
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