Add an HTTP library that wraps dart:io.

pkg/http/lib/src/base_response.dart

+// 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.
+
+library base_response;
+
+import 'dart:io';
+
+/// The base class for HTTP responses.
+///
+/// Subclasses of [BaseResponse] are usually not constructed manually; instead,
+/// they're returned by [BaseClient.send] or other HTTP client methods.
+abstract class BaseResponse {
+  /// The status code of the response.
+  final int statusCode;
+
+  /// The reason phrase associated with the status code.
+  final String reasonPhrase;
+
+  /// The size of the response body, in bytes. If the size of the request is not
+  /// known in advance, this is -1.
+  final int contentLength;
+
+  // TODO(nweiz): automatically parse cookies from headers
+
+  // TODO(nweiz): make this a HttpHeaders object.
+  /// The headers for this response.
+  final Map<String, String> headers;
+
+  /// Whether this response is a redirect.
+  final bool isRedirect;
+
+  /// Whether the server requested that a persistent connection be maintained.
+  final bool persistentConnection;
+
+  /// Creates a new HTTP response.
+  BaseResponse(
+      this.statusCode,
+      this.contentLength,
+      {this.headers: const <String>{},
+       this.isRedirect: false,
+       this.persistentConnection: true,
+       this.reasonPhrase});
+}