Show only used classes from dart:io
Ensure we don't accidentally use/expose a dart:io class
diff --git a/lib/http_io.dart b/lib/http_io.dart
index 8fe4ba0..fe5846e 100644
--- a/lib/http_io.dart
+++ b/lib/http_io.dart
@@ -15,7 +15,26 @@
LinkedListEntry,
UnmodifiableMapView;
import 'dart:convert';
-import 'dart:io';
+import 'dart:io'
+ show
+ BytesBuilder,
+ GZIP,
+ HandshakeException,
+ InternetAddress,
+ IOException,
+ IOSink,
+ Platform,
+ SecureServerSocket,
+ SecureSocket,
+ SecurityContext,
+ ServerSocket,
+ Socket,
+ SocketException,
+ SocketOption,
+ stderr,
+ TlsException,
+ X509Certificate,
+ ZLibEncoder;
import 'dart:math';
import 'dart:typed_data';