[Qt-interest] slot connected to QAbstractSocket::QIODevice::readyRead () recieves multiple responses at once

[Thiago Macieira]

Em Quarta-feira 15 Abril 2009, às 14:22:05, Neel Basu escreveu:
> If a big response is splitted into multiple messages would they have the
> same Acknowledgement Number

If one side sends two TCP packets in sequence, the receiver is allowed to 
reply with only one TCP packet with ACK of the highest sequence number. That 
means the receiver has received all packets up until that.

If the receiver only received the latter of two packets, it cannot use that 
second packet's sequence number in the ACK. It has to use the ACK from before 
the the first of the two packets (in your example, that would be 0). But 
there's an extension that allows the server to say, in addition, which other 
byte ranges it has received, so that the sender doesn't have to resend them.

-- 
Thiago Macieira - thiago.macieira (AT) nokia.com
  Senior Product Manager - Nokia, Qt Software
     Sandakerveien 116, NO-0402 Oslo, Norway
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