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

[Patrick McManus <[e-mail]>]

On Wed, 2011-05-25 at 15:31 +0900, Takeshi Yoshino wrote:

> 
> Sorry, I couldn't get you. A and B don't have to use the same
> algorithm, but in fact those algorithms need coordination. A's
> algorithm must choose X for its Ping where X != Y which B's algorithm
> chooses for its unsolicited Pong. Well, I agree that I'm saying
> something paranoid, but it's true.

But if A's algorithm is "unpredictable random sequence" then B cannot
realistically match A's value even if they are uncoordinated. Just make
the random space sufficiently large - these are infrequent events after
all.

> How about this? Semantically a bit smaller change.
> "Body of Ping and unsolicited body can be empty. IF Ping or
> unsolicited Pong have non-empty body, they must start with 0x00 and
> 0x01"
> This doesn't break interoperability with -07 or add new constraint to

that does break interoperability, though. a Ping of "0x23 0x24 0x25
0x26" is legal under -07 and invalid under that text. s/must/SHOULD
would repair that, I suppose.

If we need to change the text then let's do it. But really, is any
serious problem being solved that an implementation cannot solve for its
self with the selection of an unpredictable body in the ping using the
-07 rules? It's time to ship the protocol already.