headerEL

fun <T : Any> headerEL(    key: Metadata.Key<T>,     el: String,     optional: Boolean,     clazz: Class<T>): Self

Java API. You have to provide the class of what type the el should evaluate to.


inline fun <T : Any> headerEL(    key: Metadata.Key<T>,     el: String,     optional: Boolean = false): Self