gateway-provider-security-authc-anon/src/main/java/org/apache/knox/gateway/deploy/AnonymousAuthDeploymentContributor.java
gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/deploy/HeaderPreAuthContributor.java

gateway-provider-security-authc-anon/src/main/java/org/apache/knox/gateway/filter/AnonymousAuthFilter.java
gateway-provider-security-preauth/src/main/java/org/apache/knox/gateway/preauth/filter/AbstractPreAuthFederationFilter.java