add method
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());
}
}