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https://issues.apache.org/jira/browse/CXF-5417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13864129#comment-13864129
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Sergey Beryozkin commented on CXF-5417:
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Hi Andriy,

I think the idea behind JAX-RS ConnectionCallback is to help with optimizing 
the async applications, example, they can clean up the current AsyncResponse 
state, and I think CXF itself will be able to optimize a bit. This is why it is 
optional to support but can be helpful, I would not be surprised if RI were 
supporting it. Some users asked about it too.   
Does Jetty offer a handler which can callback if it detects the disconnect ? If 
yes, then we can offer a link to it and document that it is not guaranteed to 
be predictable, etc.
Let us know please if you find Jetty offering a handler, we can then discuss 
how to link to it
Thanks, Happy New Year
Sergey

> Support optional JAX-RS 2.0 ConnectionCallback
> ----------------------------------------------
>
>                 Key: CXF-5417
>                 URL: https://issues.apache.org/jira/browse/CXF-5417
>             Project: CXF
>          Issue Type: Improvement
>          Components: JAX-RS, Transports
>            Reporter: Sergey Beryozkin
>            Priority: Minor
>
> https://jax-rs-spec.java.net/nonav/2.0/apidocs/javax/ws/rs/container/ConnectionCallback.html
> lets JAX-RS 2.0 applications receive the notifications when a given client 
> has disconnected.
> We can probably build something on top of the Jetty-specific connector and 
> also enhance CXF Continuation API. 



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