simpleResponseHeaders constant Null safety
List of 'Simple' CORS Response headers.
These headers can be returned in a response without explicitly exposing them and cannot be changed.
Implementation
static const List<String> simpleResponseHeaders = [
  "cache-control",
  "content-language",
  "content-type",
  "content-type",
  "expires",
  "last-modified",
  "pragma"
];