astitcher commented on pull request #348:
URL: https://github.com/apache/qpid-proton/pull/348#issuecomment-998209340


   > Yes, https://pagure.io/koji/issue/3120 has the background. There is some 
confusion around what a `0` TTL means. Does it mean "send a header with a zero 
value", or "send no header" ?
   
   Incidentally setting a ttl header value of 0 would be (mostly) useless 
because it means the message has 0ms before it expires, in other words it is 
already expired and can be immediately discarded - so any ActiveMQ behaviour 
that takes this to mean keep indefinitely is wrong.
   
   However I expect that what is actually happening is that the ttl value is 
not being sent at all and the broker is just not configured to auto delete 
messages at all.


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