Keep track of the request and response state in the HTTP client connection

tests/standalone/io/regress-6521.dart

Index: tests/standalone/io/regress-6521.dart
diff --git a/tests/standalone/io/regress-6521.dart b/tests/standalone/io/regress-6521.dart
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+// Copyright (c) 2012, 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.
+//
+// Regression test for http://code.google.com/p/dart/issues/detail?id=6393.
+
+import "dart:io";
+import "dart:uri";
+
+var client = new HttpClient();
+var clientRequest;
+
+void main() {
+  var server = new HttpServer();
+  server.listen("127.0.0.1", 0);
+  server.defaultRequestHandler = (req, rsp) {
+    req.inputStream.onData = () {
+      req.inputStream.read();
+      rsp.outputStream.close();
+    };
+    req.inputStream.onClosed = () {
+      client.shutdown();
+      server.close();
+    };
+  };
+
+  var connection = client.openUrl(
+      "POST",
+      new Uri.fromString("http://localhost:${server.port}/"));
+  connection.onRequest = (request) {
+    // Keep a reference to the client request object.
+    clientRequest = request;
+    request.outputStream.write([0]);
+  };
+  connection.onResponse = (response) {
+    response.inputStream.onClosed = () {
+      // Wait with closing the client request until the response is done.
+      clientRequest.outputStream.close();
+    };
+  };
+}