Ensure that HTTP OPTIONS handling involves the proper handler chain

This is done in order to be more consistent with how
other cases are handled and how RESTEasy Classic handles things as well

Fixes: quarkusio#26828

extensions/resteasy-reactive/quarkus-resteasy-reactive/deployment/src/test/java/io/quarkus/resteasy/reactive/server/test/customproviders/OptionsRequestTest.java

@@ -0,0 +1,63 @@
+package io.quarkus.resteasy.reactive.server.test.customproviders;
+
+import static io.restassured.RestAssured.*;
+import static io.restassured.RestAssured.given;
+import static org.hamcrest.Matchers.equalTo;
+import io.quarkus.test.QuarkusUnitTest;
+import io.restassured.RestAssured;
+import java.util.List;
+import java.util.function.Supplier;
+import javax.ws.rs.Consumes;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.container.ContainerRequestContext;
+import javax.ws.rs.container.ContainerResponseContext;
+import javax.ws.rs.core.HttpHeaders;
+import javax.ws.rs.core.MediaType;
+import org.jboss.resteasy.reactive.server.ServerRequestFilter;
+import org.jboss.resteasy.reactive.server.ServerResponseFilter;
+import org.jboss.shrinkwrap.api.ShrinkWrap;
+import org.jboss.shrinkwrap.api.spec.JavaArchive;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+public class OptionsRequestTest {
+
+    @RegisterExtension
+    static QuarkusUnitTest test = new QuarkusUnitTest()
+            .setArchiveProducer(new Supplier<>() {
+                @Override
+                public JavaArchive get() {
+                    return ShrinkWrap.create(JavaArchive.class)
+                            .addClasses(PreMatchingHeadersFilterTest.Resource.class);
+                }
+            });
+
+    @Test
+    public void testJsonHeaderAdded() {
+        when()
+                .get("/test")
+                .then()
+                .statusCode(200)
+                .header("X-Foo", equalTo("Bar"))
+                .header("Allow", equalTo("Bar"));
+    }
+
+    @Path("test")
+    public static class Resource {
+
+        @GET
+        public String hello() {
+            return "hello";
+        }
+    }
+
+    public static class Filters {
+        @ServerResponseFilter
+        public void preMatchingFilter(ContainerResponseContext context) {
+            context.getHeaders().putSingle("X-Foo", "Bar");
+        }
+    }
+}

independent-projects/resteasy-reactive/server/runtime/src/main/java/org/jboss/resteasy/reactive/server/handlers/ClassRoutingHandler.java

@@ -44,7 +44,7 @@ public void handle(ResteasyReactiveRequestContext requestContext) throws Excepti
             if (requestMethod.equals(HttpMethod.HEAD)) {
                 mapper = mappers.get(HttpMethod.GET);
             } else if (requestMethod.equals(HttpMethod.OPTIONS)) {
-                Set<CharSequence> allowedMethods = new HashSet<>();
+                Set<String> allowedMethods = new HashSet<>();
                 for (String method : mappers.keySet()) {
                     if (method == null) {
                         continue;
@@ -53,7 +53,7 @@ public void handle(ResteasyReactiveRequestContext requestContext) throws Excepti
                 }
                 allowedMethods.add(HttpMethod.OPTIONS);
                 allowedMethods.add(HttpMethod.HEAD);
-                requestContext.serverResponse().setResponseHeader(HttpHeaders.ALLOW, allowedMethods).end();
+                requestContext.abortWith(Response.ok().allow(allowedMethods).build());
                 return;
             }
             if (mapper == null) {