Fx4: Zimbra throws 501 "Not implemented yet" for freebusy

[uogpjf]

Zimbra allows publication of "free/busy" times via a website like:
http://mail.wherever:80/home/ddd@wherever?fmt=freebusy

(Very handy for letting people outside your organization know when you're busy.)

A lot of us use Firefox for Zimbra Web mail (it has many advantages),
but I have found one (only one so far!) bug in Firefox 4.0 support.

The freebusy web page displays fine in Chrome10, IE9, and Fx3.6, but Fx4.0 gives:

"HTTP ERROR 501
Problem accessing /service/home/ddd@wherever. Reason:
not implemented yet
Powered by Jetty://"

Does anyone know why yet?

[uogpjf]

Found it:
http://mail.wherever:80/home/ddd@wherever?fmt=freebusy/ throws the 501
http://mail.wherever:80/home/ddd@wherever?fmt=freebusy is OK.

(Now how did the trailing "/" get there? - I dunno).