add method

void add(
  1. String header,
  2. dynamic value
)

Add header with value.

value can be a List

Implementation

void add(String header, dynamic value) {
  if (value == null) return;
  final list = _values.putIfAbsent(header.toLowerCase(), () => []);
  if (value is List) {
    list.addAll(value.map((o) => o.toString()));
  } else {
    list.add(value.toString());
  }
}