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https://issues.apache.org/jira/browse/HTTPCORE-422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333411#comment-15333411
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Oleg Kalnichevski commented on HTTPCORE-422:
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Could you please try out this patch and let me know if that resolves the issue
for you?
https://github.com/ok2c/httpcore/commit/f1135662c5b9d4e8d7a9b4ccd3228139163eca57
Oleg
> BasicAsyncResponseConsumer#onEntityEnclosed is triggered for HEAD responses
> ---------------------------------------------------------------------------
>
> Key: HTTPCORE-422
> URL: https://issues.apache.org/jira/browse/HTTPCORE-422
> Project: HttpComponents HttpCore
> Issue Type: Bug
> Components: HttpCore NIO
> Affects Versions: 4.4.5
> Reporter: Tom Fitzhenry
> Assignee: Oleg Kalnichevski
> Priority: Minor
> Fix For: 4.4.6
>
>
> HttpAsyncRequestExecutor#responseReceived(NHttpClientConnection) calls
> HttpAsyncResponseConsumer#responseReceived(HttpResponse) via
> HttpAsyncClientExchangeHandler#responseReceived(HttpResponse).
> See
> https://github.com/apache/httpcore/blob/4.4.x/httpcore-nio/src/main/java/org/apache/http/nio/protocol/HttpAsyncRequestExecutor.java#L302
> .
> It does this even if the request is a HEAD request. If your
> HttpAsyncResponseConsumer is a BasicAsyncResponseConsumer, then this will
> allocate a buffer of size content-length kB (or 4kB, if content-length does
> not exist).
> For a simple proxying Java app, profiling revealed this the allocation due to
> this was a bottleneck.
> It'd be nice if
> Are there use cases for calling
> HttpAsyncResponseConsumer#responseReceived(HttpResponse) on HEAD requests? If
> not, perhaps it could not be called.
> FWIW, it looks like httpclient doe not call the corresponding method for HEAD
> requests:
> https://github.com/apache/httpcore/blob/4.4.x/httpcore/src/main/java/org/apache/http/protocol/HttpRequestExecutor.java#L273-L275
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