Remove HttpClientRequest.response, as it's identical to HttpClientRequest.done.

pkg/http/lib/src/io_client.dart

Index: pkg/http/lib/src/io_client.dart
diff --git a/pkg/http/lib/src/io_client.dart b/pkg/http/lib/src/io_client.dart
index 9bbb7ee00a4f5113ed9d25fb0097261b1358e13f..b7a67309b51c5b2b70d11c4942f1562e9408c085 100644
--- a/pkg/http/lib/src/io_client.dart
+++ b/pkg/http/lib/src/io_client.dart
@@ -32,8 +32,7 @@ class IOClient extends BaseClient {
       request.headers.forEach((name, value) {
         ioRequest.headers.set(name, value);
       });
-      return Future.wait([stream.pipe(ioRequest), ioRequest.response])
-          .then((list) => list[1]);
+      return stream.pipe(ioRequest);
     }).then((response) {
       var headers = {};
       response.headers.forEach((key, values) {