Checks whether the request is a valid WebSocket upgrade request.
static bool isUpgradeRequest(HttpRequest request) {
  return _WebSocketTransformerImpl._isUpgradeRequest(request);
}
    © 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
    https://api.dart.dev/stable/2.5.0/dart-io/WebSocketTransformer/isUpgradeRequest.html