defaultHeaders function

Implementation

Map<String, String> defaultHeaders() {
  Map<String, String> header = {};

  header.putIfAbsent(HttpHeaders.cacheControlHeader, () => 'no-cache');
  header.putIfAbsent('Access-Control-Allow-Headers', () => '*');
  header.putIfAbsent('Access-Control-Allow-Origin', () => '*');

  return header;
}