Index: sdk/lib/io/websocket_impl.dart |
diff --git a/sdk/lib/io/websocket_impl.dart b/sdk/lib/io/websocket_impl.dart |
index bcb800d84aa80e8f4ca0d812f641b231012f9336..4f00a17a94cd76157157be9ba0933353b26f80bd 100644 |
--- a/sdk/lib/io/websocket_impl.dart |
+++ b/sdk/lib/io/websocket_impl.dart |
@@ -458,9 +458,7 @@ class _WebSocketTransformerImpl implements WebSocketTransformer { |
HttpResponse response, CompressionOptions compression) { |
var extensionHeader = request.headers.value("Sec-WebSocket-Extensions"); |
- if (extensionHeader == null) { |
- extensionHeader = ""; |
- } |
+ extensionHeader ??= ""; |
var hv = HeaderValue.parse(extensionHeader, valueSeparator: ','); |
if (compression.enabled && hv.value == _WebSocketImpl.PER_MESSAGE_DEFLATE) { |