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(a)wherethebitsroam.com&gt; > To: undertow-dev(a)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(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/undertow-dev

You just return the original conduit, but set the headers in the wrapper class itself. Stuart ----- Original Message ----- > From: "Jeff Williams" <jeffw(a)wherethebitsroam.com&gt; > To: "Stuart Douglas" <sdouglas(a)redhat.com&gt; > Cc: undertow-dev(a)lists.jboss.org > Sent: Monday, 3 November, 2014 6:34:28 PM > Subject: Re: [undertow-dev] Changing headers on proxy response > > 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(a)redhat.com&gt; 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(a)wherethebitsroam.com&gt; > > > To: undertow-dev(a)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(a)lists.jboss.org > > > https://lists.jboss.org/mailman/listinfo/undertow-dev > > >