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https://issues.apache.org/jira/browse/HTTPCLIENT-1944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16583723#comment-16583723
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Oleg Kalnichevski commented on HTTPCLIENT-1944:
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[~rschmitt] HTTP/2 protocol provides a means of cancellation of ongoing
requests, whereas HTTP/1.1 does not. What would you expect to happen in case of
HTTP/1.1 response future cancellation? Connection shutdown?
OlegÂ
> Async request aborts working on HTTP/2, but not HTTP/1.1
> --------------------------------------------------------
>
> Key: HTTPCLIENT-1944
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1944
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Affects Versions: 5.0 Beta1
> Reporter: Ryan Schmitt
> Priority: Major
>
> I have some test code that looks approximately like the following:
> {code:java}
> client = useHttp2 ? HttpAsyncClients.createHttp2Default() :
> HttpAsyncClients.createDefault();
> client.start();
> AsyncEntityProducer requestBody = ...; // A slow, endless stream of data
> AsyncRequestProducer post = AsyncRequestBuilder.create("POST")
> .setUri(endpoint)
> .setEntity(requestBody)
> .build();
> Future<SimpleHttpResponse> future = client.execute(post,
> SimpleResponseConsumer.create(), new FutureCallback<SimpleHttpResponse>() {
> @Override
> public void completed(SimpleHttpResponse result) {
> System.out.println("Request future completed");
> }
> @Override
> public void failed(Exception ex) {
> System.out.println("Request future failed");
> }
> @Override
> public void cancelled() {
> System.out.println("Request future cancelled");
> }
> });
> Thread.sleep(5_000);
> future.cancel(true);
> {code}
> What I'm observing is that request cancellation works immediately with the
> HTTP/2 request, but doesn't work at all with the HTTP/1.1 request, which runs
> until it times out. My own FutureCallback gets notified of the cancellation
> of the request, but nothing else takes place within the client itself; the
> Cancellable associated with the request at the time of cancellation is a
> NOOP_CANCELLABLE, whereas the HTTP/2 request has a callback installed that
> aborts the underlying h2 stream.
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