Make some HTTP utility functions public

tests/corelib/uri_query_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";
 
 void testInvalidArguments() {
 }
 
 void testEncodeQueryComponent() {
@@ skipping 11 matching lines @@
   test(String query, Map<String, String> parameters, [String normalizedQuery]) {
     if (normalizedQuery == null) normalizedQuery = query;
     check(uri) {
       Expect.equals(normalizedQuery, uri.query);
       if (query.isEmpty) {
         Expect.equals(normalizedQuery, uri.toString());
       } else {
         Expect.equals("?$normalizedQuery", uri.toString());
       }
       if (parameters.containsValue(null)) {
+        var map = new Map.from(parameters);
+        map.forEach((k, v) { if (v == null) map[k] = ""; });
+        Expect.mapEquals(map, uri.queryParameters);
       } else {
         Expect.mapEquals(parameters, uri.queryParameters);
       }
     }
 
     var uri1 = new Uri(queryParameters: parameters);
     var uri2 = new Uri(query: query);
     var uri3 = Uri.parse("?$query");
     check(uri1);
     check(uri2);
     check(uri3);
     Expect.equals(uri1, uri3);
     Expect.equals(uri2, uri3);
+    if (parameters.containsValue(null)) {
+      var map = new Map.from(parameters);
+      map.forEach((k, v) { if (v == null) map[k] = ""; });
+      Expect.mapEquals(map, Uri.splitQueryString(query));
+    } else {
+      Expect.mapEquals(parameters, Uri.splitQueryString(query));
+    }
   }
 
   test("", {});
   test("A", {"A": null});
   test("%25", {"%": null});
   test("%41", {"A": null}, "A");
   test("%41A", {"AA": null}, "AA");
   test("A", {"A": ""});
   test("%25", {"%": ""});
   test("%41", {"A": ""}, "A");
@@ skipping 105 matching lines @@
   test(new Uri(queryParameters: {"a": "b", "c": "d"}).queryParameters);
 }
 
 main() {
   testInvalidArguments();
   testEncodeQueryComponent();
   testQueryParameters();
   testInvalidQueryParameters();
   testQueryParametersImmutableMap();
 }