necouchman commented on issue #348: GUACAMOLE-422: Forward Timezone to RDP and 
SSH Connections
URL: https://github.com/apache/guacamole-client/pull/348#issuecomment-477854148
 
 
   @mike-jumper: So, I think I have backward compatibility from a guacd 
perspective handled - that is, the newer guacd will accept either older clients 
that do not provide the "timezone" handshake parameter, or newer clients that 
do, without any problems.
   
   I'm struggling with backward compatibility from the other angle - that is, 
if I use the newer client that sends timezone with the older (1.0.0) guacd, I 
get protocol errors.  I am only sending the `timezone` parameter through the 
tunnel when set; however, the issue is that, as I have it implemented, today, 
I'm auto-detecting the timezone via JSTZ and sending that information 
automatically (=always).  So, not sure what other ways might be available to 
make this backward-compatible?  I looked at the `args` sent back from the 
server, but am not really sure the best way to implement sending back some sort 
of protocol version - right now it looks like the only thing that gets sent 
back is a list of acceptable parameters for the given protocol?

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