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https://issues.apache.org/jira/browse/HTTPASYNC-163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17230995#comment-17230995
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Oleg Kalnichevski commented on HTTPASYNC-163:
---------------------------------------------
[~rymndhng] The problem is you are using `MultipartFormEntity` built for the
classic HttpClient with HttpAsyncClient. `MultipartFormEntity` is based on
`InputStream` / `OutputStream` APIs which are inherently blocking.
`MultipartFormEntity`cannot stream out its content to an asynchronous I/O
channel with `#writeTo` method, so has to buffer its full content in memory in
order to make it available via `#getContent`.
One should either build a custom `HttpAsyncRequestProducer` capable of
producing multipart content asynchronously or wrap `MultipartFormEntity` with
`BufferedHttpEntity` if they do not mind buffering multipart content in memory
prior to writing it out to an asynchronous I/O channel.
Oleg
> Unable to upload MultipartFormEntity larger than 25 kb
> ------------------------------------------------------
>
> Key: HTTPASYNC-163
> URL: https://issues.apache.org/jira/browse/HTTPASYNC-163
> Project: HttpComponents HttpAsyncClient
> Issue Type: Bug
> Affects Versions: 4.1.4
> Reporter: Raymond Huang
> Priority: Minor
>
> From investigation, this appears to be caused by a specific check in the
> code. I filed a bug because it's unclear why there is a 25 kb limit using
> `getContent`.
> The non-async client consumes the Entity by calling `writeTo` which does not
> have this 25kb restriction.
> See
> [https://github.com/apache/httpcomponents-client/blob/4.5.x/httpmime/src/main/java/org/apache/http/entity/mime/MultipartFormEntity.java#L102-L104]
>
> This issue was identified in clj-http. See
> [https://github.com/dakrone/clj-http/issues/560]
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