dvRenderedPageNotModified function
Implementation
bool dvRenderedPageNotModified(String? condition, String etag) =>
condition != null &&
condition.split(',').any((value) {
final tag = value.trim();
String opaque(String value) =>
value.startsWith('W/') ? value.substring(2) : value;
return tag == '*' || opaque(tag) == opaque(etag);
});