Don't change the case of cookie names and values

tests/standalone/io/http_cookie_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 "package:expect/expect.dart";
+import "dart:async";
+import "dart:io";
+
+void testCookies() {
+  var cookies = [{'abc': 'def'},
+                 {'ABC': 'DEF'},
+                 {'Abc': 'Def'},
+                 {'Abc': 'Def', 'SID': 'sffFSDF4FsdfF56765'}];
+
+  HttpServer.bind("127.0.0.1", 0).then((server) {
+    server.listen((HttpRequest request) {
+      // Collect the cookies in a map.
+      var cookiesMap = {};
+      request.cookies.forEach((c) => cookiesMap[c.name] = c.value);
+      int index = int.parse(request.uri.path.substring(1));
+      Expect.mapEquals(cookies[index], cookiesMap);
+      // Return the same cookies to the client.
+      cookiesMap.forEach((k, v) {
+        request.response.cookies.add(new Cookie(k, v));
+      });
+      request.response.close();
+    });
+
+    int count = 0;
+    HttpClient client = new HttpClient();
+    for (int i = 0; i < cookies.length; i++) {
+      client.get("127.0.0.1", server.port, "/$i")
+          .then((request) {
+            // Send the cookies to the server.
+            cookies[i].forEach((k, v) {
+              request.cookies.add(new Cookie(k, v));
+            });
+            return request.close();
+          })
+          .then((response) {
+            // Expect the same cookies back.
+            var cookiesMap = {};
+            response.cookies.forEach((c) => cookiesMap[c.name] = c.value);
+            Expect.mapEquals(cookies[i], cookiesMap);
+            response.listen(
+                (d) {},
+                onDone: () {
+                  if (++count == cookies.length) {
+                    client.close();
+                    server.close();
+                  }
+                });
+          })
+          .catchError((e) {
+            String msg = "Unexpected error $e";
+            var trace = getAttachedStackTrace(e);
+            if (trace != null) msg += "\nStackTrace: $trace";
+            Expect.fail(msg);
+         });
+    }
+  });
+}
+
+void main() {
+  testCookies();
+}