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From Mark Thomas <>
Subject Re: Websocket ping/pong feature request
Date Fri, 09 Nov 2012 17:14:13 GMT
On 09/11/2012 16:03, Sean Winterberger wrote:
> We are attempting to implement ping/pong functionality but have run into a
> wall with the Tomcat Websocket implementation.  Unless we are missing
> something, there seems to be no way of modifying the opcode on a frame
> prior to sending it without using reflection.  The WsOutbound object
> currently has a method for pong, but we would like to be sending a ping
> from the server to all clients.
> We could implement our own ping/pong with our client devices however the
> RFC implementation is much more attractive due to its small size, plus we
> already have it implemented in our websocket implementation on the client
> side.
> If there was a way to safely get a handle on the UpgradeOutbound object we
> could write the frame ourselves.
> Is there any plan to add a ping(ByteBuffer data) method or a method which
> allows modifications to the opcode of a frame?

No plans (focus is currently on Tomcat 7 bugs and Tomcat 8) but a patch
that implemented ping should be pretty simple and is very likely to be
accepted. ping() is almost just a copy and paste of pong().

An enhancement request in BZ is the way to go with this. If you are able
to provide a patch in the next few days it will almost certainly make it
into 7.0.33 else it should be in 7.0.34.


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