getHeaderOrNull
fun <T> getHeaderOrNull(serializer: DeserializationStrategy<T>, name: String, jsonInstance: Json = Jwt.defaultJsonParser): T?(source)
Returns the value of the named header parameter deserialized using the given serializer, or null if absent.
Return
the deserialized header value, or null if the parameter is not present
Parameters
serializer
the deserialization strategy for type T
name
the header parameter name
jsonInstance
the Json instance to use for deserialization; defaults to the library's Jwt.defaultJsonParser configuration (ignoreUnknownKeys = true, explicitNulls = false)