Remove _HttpUtils from dart:io.

tests/standalone/io/http_body_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:io';
 import 'dart:utf';
 
 import 'package:expect/expect.dart';
 
 void testHttpClientResponseBody() {
@@ skipping 237 matching lines @@
 
   test('application/x-www-form-urlencoded',
        '%E5%B9%B3%3D%E4%BB%AE%E5%90%8D=%E5%B9%B3%E4%BB%AE%E5%90%8D&b'
        '=%E5%B9%B3%E4%BB%AE%E5%90%8D'.codeUnits,
        { 'b' : '平仮名',
          '平=仮名' : '平仮名'},
        "form");
 
   test('application/x-www-form-urlencoded',
        'a=%F8+%26%23548%3B'.codeUnits,
-       { 'a' : '\u{FFFD}Ȥ' },
+       { 'a' : '\u{FFFD} Ȥ' },

[Lasse Reichstein Nielsen, 2013/07/04 14:56:33]

This is doing UTF-8 decoding, right?
The \u{FFFD} (just \uFFFD would do too) comes from failing to UTF-8 decode
0xF8,0x2B. It only removes the first byte, assuming it's a short UTF-8 sequence
followed by a normal "+".

I think that is the correct behavior.

The original result must come from a decoder that considers "+" part of the
malformed sequence, and eats that too. Does that decoder still exist? If so, are
there tests of it that would catch this.

How about strings like
 "%C0%A0" (well-formed but invalid UTF-8)
 "x%A0x" (Another malformed UTF-8)
 "x%C0x" (Another malformed UTF-8)

[Anders Johnsen, 2013/07/05 09:51:28]

Yes, I also think this is correct. Added those tests.

        "form");
 
   test('application/x-www-form-urlencoded',
        'a=%C3%B8+%C8%A4'.codeUnits,
        { 'a' : 'ø Ȥ' },
        "form");
 
   test('application/x-www-form-urlencoded',
        'a=%F8+%26%23548%3B'.codeUnits,
        { 'a' : 'ø Ȥ' },
@@ skipping 47 matching lines @@
   test('application/x-www-form-urlencoded',
        'name=%C8%A4%C8%A4'.codeUnits,
        { 'name' : 'ȤȤ' },
        "form");
 }
 
 void main() {
   testHttpClientResponseBody();
   testHttpServerRequestBody();
 }