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https://issues.apache.org/jira/browse/HTTPCORE-289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186215#comment-13186215
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Oleg Kalnichevski commented on HTTPCORE-289:
--------------------------------------------
The problem stems from how HttpAsyncService handles pipelined (out of sequence)
request messages. Essentially, once a request message has been received the
protocol handler stops reacting to input events until a response is generated
and fully written out. So, if you open a connection with telnet and do
something like that
---
GET / HTTP/1.1
GET / HTTP/1.1
----
all at once, HttpAsyncService will correctly generate two response messages
regardless how long it takes to generate each message. The side-effect of this
approach is that HttpAsyncService cannot detect and react to the opposite end
causing the connection to go to a half-closed state while waiting for a
response to get submitted.
Oleg
> Cancellable#cancel() not invoked when network connection dies
> -------------------------------------------------------------
>
> Key: HTTPCORE-289
> URL: https://issues.apache.org/jira/browse/HTTPCORE-289
> Project: HttpComponents HttpCore
> Issue Type: Bug
> Components: HttpCore NIO
> Affects Versions: 4.2-alpha2
> Reporter: Geir Harald Hansen
> Fix For: 4.2-alpha3
>
> Attachments: Test.java
>
>
> I am rewriting my software to use the new API that comes with 4.2-alpha2.
> Returning a Cancellable from HttpAsyncRequestHandler#handle() seems like a
> good idea for long running requests like long polling. But I don't ever see
> Cancellable#cancel() being called.
> I telnet into my server and type the necessary HTTP to start a long running
> request. A Cancellable is created and returned from handle(). Then I kill the
> telnet process, thereby killing the connection. I expect cancel() to be
> invoked in the connection's Cancellable at this point, but nothing happens.
> cancel() is not invoked in my Cancellable, and there are no calls to
> HttpAsyncServiceHandler#closed(), HttpAsyncServiceHandler#exception() or
> DefaultServerIODispatch#onClosed() either.
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