on

fun on(predicate: HttpPredicate = HttpPredicate(), callback: HttpCallbackType)
fun on(    methods: Set<HttpMethod> = emptySet(),     pattern: String = "",     exception: KClass<out Exception>? = null,     status: HttpStatus? = null,     callback: HttpCallbackType)
fun on(method: HttpMethod, pattern: String = "", callback: HttpCallbackType)
fun on(pattern: String, callback: HttpCallbackType)