[undertow-dev] Gzip and Proxy

[Stuart Douglas]

https://issues.jboss.org/browse/UNDERTOW-810

I have fixed this upstream.

Stuart

On Mon, Aug 29, 2016 at 5:19 PM, Martin Andersson
<martin.andersson at purplescout.se> wrote:
> Hi all,
>
> I've seem to have hit a bug in undertow when combining proxying and gzip.
>
> I'm trying to use undertow as a reverse-proxy and also compressing the
> result when clients support it. Undertow-code below.
>
> * Proxying without compressing works fine (curl -v localhost:8099/proxy)
> * Compressing content that is not proxied works fine (curl -v --compress
> localhost:8099/local)
> * Proxy and compression just hangs. Not even headers are received (curl -v
> --compress localhost:8099/proxy)
>
> Trying to debug what's going on I found that the GzipStreamSinkConduit
> receives all content but is never flushed.
>
> The call sequence for GzipStreamSinkConduit for proxied content is:
> write(ByteBuffer src) - all context from the proxied app is written.
> wakeupWrites() - which basically does nothing. Ends up in
> DeflatingStreamSinkConduit.queueWriteListener() which calls any
> WriteReadyHandlers but there are none.
>
> Any clues?
>
> My code to setup undertow:
>
> final PathHandler pathHandler = Handlers.path();
> pathHandler.addExactPath("/local", new HttpHandler() {
> @Override
> public void handleRequest(HttpServerExchange exchange) throws Exception {
> exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
> exchange.getResponseSender().send("Hello World"); }
> });
> pathHandler.addPrefixPath("/proxy",
> new ProxyHandler(
> new SimpleProxyClientProvider(new URI("http://localhost:8060/menu")),
> ResponseCodeHandler.HANDLE_404));
>
> final EncodingHandler handler =
> new EncodingHandler(pathHandler, new ContentEncodingRepository()
>  .addEncodingHandler("gzip",
>  new GzipEncodingProvider(), 50,
> Predicates.truePredicate()));
>
> Undertow.builder()
> .addHttpListener(8099, "0.0.0.0")
> .setHandler(handler)
> .build().start();
>
> --
> Br,
> Martin Andersson
> Purple Scout AB
> +46 732 05 14 01
>
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