[undertow-dev] Changing headers on proxy response

[Jeff Williams]

Stuart,

Thanks for that. I'm guessing I can just extend
org.xnio.conduits.AbstractStreamSinkConduit<StreamSinkConduit> and just
pass everything through to next? Since there is not much information around
about the StreamSinkConduit, where would be the best place to add the
headers? In the first call to one of the transferFrom methods?

I've added a JIRA for this: https://issues.jboss.org/browse/UNDERTOW-340

Regards,
Jeff

On 2 November 2014 04:24, Stuart Douglas <sdouglas at redhat.com> wrote:

> You can set them in a response wrapper
> (io.undertow.server.HttpServerExchange#addResponseWrapper) and they should
> not be overriden, although this is not ideal.
>
> If you file a JIRA I will look at adding better support for this into the
> proxy.
>
> Stuart
>
> ----- Original Message -----
> > From: "Jeff Williams" <jeffw at wherethebitsroam.com>
> > To: undertow-dev at lists.jboss.org
> > Sent: Saturday, 1 November, 2014 12:43:38 AM
> > Subject: [undertow-dev] Changing headers on proxy response
> >
> > Hi,
> >
> > I am currently using a customer handler wrapping the proxy handler. I
> want to
> > set some response headers from my handler, but if they exist in the
> response
> > from the proxy's backend, they are overridden. Example code:
> >
> > Undertow.builder()
> > .addHttpListener(8080, "localhost")
> > .setHandler(new MyHandler(new ProxyHandler(proxy, 30000,
> ResponseCodeHandler.
> > HANDLE_404 ))).build();
> >
> > class MyHandler extends HttpHandler {
> > private static final HttpString ACCESS_CONTROL_EXPOSE_HEADERS = new
> > HttpString("Access-Control-Expose-Headers");
> > private HTTPHandler next;
> > public MyHandler(HttpHandler next) {
> > this.next = next;
> > }
> > p ublic void handleRequest(HttpServerExchange exchange ) throws
> Exception {
> > exchange .getResponseHeaders().put( ACCESS_CONTROL_EXPOSE_HEADERS , " new
> > ACEH" );
> > }
> > }
> >
> > The problem here is that the backend server responds with an
> > Access-Control-Expose-Headers header and that replaces the one I set in
> > MyHandler.
> >
> > Is there any way I can change headers after proxy has received the
> response
> > from backend and before it starts sending the response to the client?
> >
> > Regards,
> > Jeff
> >
> >
> > _______________________________________________
> > undertow-dev mailing list
> > undertow-dev at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/undertow-dev
>
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