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https://issues.apache.org/jira/browse/HTTPCORE-296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13227904#comment-13227904
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Roland Hänel commented on HTTPCORE-296:
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Hi Oleg,
Thanks for the quick reply. However one might doubt whether the solution is
really that easy. I don't think the spec is 100% clear on this issue. Section
4.1 specifies the message body optional; section 4.3 says that "The presence of
a message-body in a request is signaled by the inclusion of a Content-Length or
Transfer-Encoding header field in the request's message-headers." We all know
that POST messages usually have a message body, but I don't think we can read
from the spec that it MUST have one.
If in doubt, might I suggest that a better solution could be to handle an
entity enclosing request without message body by using a LengthDelimitedDecoder
and a length of 0. This should also work out of the box and ensure the
'obviously expected behavior'.
-Roland
> IdentityDecoder fails to consume as POST request with Content-Length 0 (zero)
> -----------------------------------------------------------------------------
>
> Key: HTTPCORE-296
> URL: https://issues.apache.org/jira/browse/HTTPCORE-296
> Project: HttpComponents HttpCore
> Issue Type: Bug
> Components: HttpCore NIO
> Affects Versions: 4.2-alpha2
> Reporter: Roland Hänel
> Fix For: 4.2-beta2
>
>
> If a client submits a POST with Content-Length 0, the HttpCore framework will
> fire the onContentReceived(...) method of the HttpAsyncRequestConsumer once.
> However, the decoder (passed as an argument to onContentReceived()) will
> never enter the "completed" state, because no bytes will actually be received
> from the client. However, reaching the "completed" stage of the decoder is an
> requirement for the HttpAsyncServiceHandler to finally process the request
> (i.e., call the handle(...) method).
> This leads to the (incorrect) behavior that it is impossible to handle a POST
> request with Content-Length 0 in HttpCore NIO.
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