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From "Bill Barker" <>
Subject Re: Ajp14 and Ajp13
Date Thu, 15 Nov 2001 23:40:38 GMT
I'm in favor of this, since the protocol is only being extended, not really

However, I think that one of the extensions that should be implemented early
on is a version negotiation so that the newer side can gracefully degrade in
the future without having to rely on the user changing configuration
----- Original Message -----
From: <>
To: <>
Sent: Thursday, November 15, 2001 3:19 PM
Subject: Ajp14 and Ajp13

> Hi,
> Right now we treat Ajp13 and 14 as 2 separate workers ( even if most of
> the code is shared). The problem is that this adds complexity that we
> could avoid.
> Given that Ajp14 is not 'official' yet, I would propose to change it to
> "Ajp14 == Ajp13 + extra functions".
> We should use exactly the same header and encapsulation as in Ajp13 -
> since this is very well tested. The main difference is in the startup
> phase, where Ajp14 will login and auto-configure.
> That can be easily configured and we can have the new Ajp14 clients
> talking with older Ajp13 servers ( so most fixes will go in the same
> codebase, without needing to fix both the new 1.4 worker and the old one).
> If the ajp14 worker will be configured with a login password - then it'll
> do the extra login and configuration steps. If not - it'll be just our old
> ajp13 client, capable to speak with tomcat3.2 ... tomcat4.0.
> On tomcat side, if the connector will be configured to require a login
> it'll behave as a ajp14 server, and do the autoconfiguration ( and refuse
> connections from unauthenticated ajp13 clients ).
> This can be extended in future as more callbacks are added. Instead of
> having ajp15, 16... we'll keep Ajp13 as the base and configure the
> calls and callbacks to use.
> The main reason for this is simplifying the code - which is very
> important to do before any extension. This would also allow a smooth
> transition - all new features will be included in mod_jk and the new java
> connector, but the user will be able to use only what he needs and
> support multiple server versions.
> What do you think ?
> Costin
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