Buffer the entire http header to one packet, and buffer other data in chunks of 4-16 kb.

tests/standalone/io/http_connection_close_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 
 import "dart:async";
 import "dart:io";
 import "dart:uri";
 
 void testHttp10Close(bool closeRequest) {
@@ skipping 33 matching lines @@
             server.close();
           });
         if (closeRequest) socket.close();
       });
   });
 }
 
 void testStreamResponse() {
   HttpServer.bind().then((server) {
     server.listen((request) {
-      // TODO(ajohnsen): Use timer (see old version).
-      for (int i = 0; i < 10; i++) {
+      var timer = new Timer.repeating(const Duration(milliseconds: 0), (_) {
         request.response.write(
             'data:${new DateTime.now().millisecondsSinceEpoch}\n\n');
-      }
+      });
+      request.response.done
+          .whenComplete(() {
+            timer.cancel();
+          })
+          .catchError((_) {});
     });
 
     var client = new HttpClient();
     client.getUrl(Uri.parse("http://127.0.0.1:${server.port}"))
       .then((request) => request.close())
       .then((response) {
         int bytes = 0;
         response.listen(
             (data) {
               bytes += data.length;
               if (bytes > 100) {
                 client.close(force: true);
               }
             },
             onError: (error) {
               server.close();
             });
       });
   });
 }
 
 main() {
   testHttp10Close(false);
   testHttp10Close(true);
   testHttp11Close(false);
   testHttp11Close(true);
   testStreamResponse();
 }