http://www.jboss.org/undertow-parent/undertow-core: Undertow (JBoss by Red Hat) 
public interface io.undertow.security.api.AuthenticationMechanism
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: io.undertow.security.api.AuthenticationMechanism
  super_class: java.lang.Object
{
  public abstract io.undertow.security.api.AuthenticationMechanism$AuthenticationMechanismOutcome authenticate(io.undertow.server.HttpServerExchange, io.undertow.security.api.SecurityContext);
    descriptor: (Lio/undertow/server/HttpServerExchange;Lio/undertow/security/api/SecurityContext;)Lio/undertow/security/api/AuthenticationMechanism$AuthenticationMechanismOutcome;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
                 Name  Flags
      exchange         final
      securityContext  final

  public abstract io.undertow.security.api.AuthenticationMechanism$ChallengeResult sendChallenge(io.undertow.server.HttpServerExchange, io.undertow.security.api.SecurityContext);
    descriptor: (Lio/undertow/server/HttpServerExchange;Lio/undertow/security/api/SecurityContext;)Lio/undertow/security/api/AuthenticationMechanism$ChallengeResult;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
                 Name  Flags
      exchange         final
      securityContext  final
}
SourceFile: "AuthenticationMechanism.java"
NestMembers:
  io.undertow.security.api.AuthenticationMechanism$AuthenticationMechanismOutcome  io.undertow.security.api.AuthenticationMechanism$ChallengeResult
InnerClasses:
  public final AuthenticationMechanismOutcome = io.undertow.security.api.AuthenticationMechanism$AuthenticationMechanismOutcome of io.undertow.security.api.AuthenticationMechanism
  public ChallengeResult = io.undertow.security.api.AuthenticationMechanism$ChallengeResult of io.undertow.security.api.AuthenticationMechanism