Default to not attach route to cookies

Closes #9393

quarkus/runtime/src/main/resources/META-INF/keycloak.conf

@@ -9,6 +9,9 @@ http-enabled=false
 # Metrics and healthcheck are disabled by default
 metrics-enabled=false
 
+# Do not attach route to cookies and rely on the session affinity capabilities from reverse proxy
+spi-sticky-session-encoder-infinispan-should-attach-route=false
+
 # Default, and insecure, and non-production grade configuration for the development profile
 %dev.http-enabled=true
 %dev.hostname-strict=false

quarkus/runtime/src/test/java/org/keycloak/quarkus/runtime/configuration/test/ConfigurationTest.java

@@ -398,6 +398,9 @@ public class ConfigurationTest {
 
         Environment.setProfile("prod");
         assertEquals("true", createConfig().getConfigValue("kc.hostname-strict").getValue());
+
+        Environment.setProfile("prod");
+        assertEquals("false", createConfig().getConfigValue("kc.spi-sticky-session-encoder-infinispan-should-attach-route").getValue());
     }
 
     private Config.Scope initConfig(String... scope) {