Re: [hybi] Ping/Pong body (was Re: TSV-Directorate review of draft-ietf-hybi-thewebsocketprotocol-07)

[Patrick McManus <[e-mail]>]

On Mon, 2011-05-23 at 13:37 +0900, Takeshi Yoshino wrote:

> 
> It's possible that A sends an unsolicited Pong with the same body as a
> Ping sent by B. How do you choose Pong body for unsolicited Pong?

I think that's looking at it backwards.

If B cares about having the mandatory pong reply be matched to B's ping
then B can simply create a non-predictable payload that -07 already
requires to be echoed in the pong. 

No change to the protocol is necessary, right?

>  As initially most of implementors are not interested in using the
> body of Ping and unsolicited Pong, they'll try to use an empty string.
> Some may choose non empty string X for its Ping body but some other
> may also use the same string X for its unsolicited Pongs' body. It
> will be quickly out of control.
> 

If the implementor cares about such things then those bodies are
extremely poor implementation decisions. It makes sense to add some
guidance to the text to help them out, but there is no reason to add
constraints here or change the existing protocol imo. If the implementor
changes their mind about being interested in such things they can change
the implementation of their ping body at the same time.