The security handler responsible for attaching the SecurityContext to the current HttpServerExchange. This handler is called early in the processing of the incoming request, subsequently supported authentication mechanisms will be added to the context, a decision will then be made if authentication is required or optional and the associated mechanisms will be called. In addition to the HTTPExchange authentication state can also be associated with the io.undertow.server.protocol.http.HttpServerConnection and with the io.undertow.server.session.Session however this is mechanism specific so it is down to the actual mechanisms to decide if there is state that can be re-used.