RESPONSE_HEADERS constant

List<String> const RESPONSE_HEADERS = const [ACCEPT_RANGES, AGE, ETAG, LOCATION, PROXY_AUTHENTICATE, RETRY_AFTER, SERVER, VARY, WWW_AUTHENTICATE]

Implementation 

static const RESPONSE_HEADERS = const [
  ACCEPT_RANGES,
  AGE,
  ETAG,
  LOCATION,
  PROXY_AUTHENTICATE,
  RETRY_AFTER,
  SERVER,
  VARY,
  WWW_AUTHENTICATE
]