[undertow-dev] Best practice for receiving/writing HTTP body by chunks

[Stuart Douglas]

getResponseSender().send(bodyByteBuffer, myIoCallback) should
definitely be invoking the IO callback. Do you have a reproducer for
the case where it does not?

Stuart

On Mon, Jul 10, 2017 at 9:31 PM, Eldad Rudich <eldadru at gmail.com> wrote:
> Hi,
>
> I'm implementing custom HTTP reverse proxy using Undertow.
> My server is listening to requests and when a new request arrives, It wraps
> the request in a proprietary protocol and redirect to another component in
> my system.
> That component takes the request data, unpack it, send it to the actual web
> server, get's the response and send the response back to my Undertow server
> in the same proprietary protocol.
> The server unpacks the response and writes it back to the user's browser.
>
> All works very well for "small" requests/response but for request/response
> that has body data that exceed some predefined amount I would like to split
> the request/response to chunks ( my own chunking mechanism, not related to
> HTTP chunking) to better handle such scenarios and not hold the entire data
> in the server's memory.
>
> In order to do that I need access to the request/response body bytes,
> I came by this thread:
> http://lists.jboss.org/pipermail/undertow-dev/2015-January/001080.html and
> tried to implement both proposed solutions
>
> When I used the async interface:
>
> HttpServerExchange.getResponseSender().send(bodyByteBuffer, myIoCallback)
>
> Sometimes my callback just not called ( nor the onComplete or the
> onException callbacks) for unknown reasons.
>
> So I tried the blocking interface instead ( from dispatched handler ):
>
> HttpServerExchange.startBlocking()
>
> HttpServerExchange.getResponseSender().send(bodyByteBuffer)
>
> That works but I read somewhere in this mailing list that the async
> interface is more efficient.
>
> The same behavior occurred when trying to receive the request body using:
> HttpServerExchange.getRequestReceiver()
> and also solved using the blocking interface.
>
> Am I missing something? what are the best practices for reading/writing
> partial request/response body?
>
> Best,
> Eldad.
>
>
>
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