Use shelf's Server API in browser/server.

lib/src/util/io.dart

 // Copyright (c) 2015, 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 test.util.io;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:mirrors';
@@ skipping 108 matching lines @@
 /// it controls whether the warning header is color; otherwise, it defaults to
 /// [canUseSpecialChars].
 void warn(String message, {bool color}) {
   if (color == null) color = canUseSpecialChars;
   var header = color
       ? "\u001b[33mWarning:\u001b[0m"
       : "Warning:";
   stderr.writeln(wordWrap("$header $message\n"));
 }
 
-/// Creates a URL string for [address]:[port].
-///
-/// Handles properly formatting IPv6 addresses.
-Uri baseUrlForAddress(InternetAddress address, int port) {
-  if (address.isLoopback) {
-    return new Uri(scheme: "http", host: "localhost", port: port);
-  }
-
-  // IPv6 addresses in URLs need to be enclosed in square brackets to avoid
-  // URL ambiguity with the ":" in the address.
-  if (address.type == InternetAddressType.IP_V6) {
-    return new Uri(scheme: "http", host: "[${address.address}]", port: port);
-  }
-
-  return new Uri(scheme: "http", host: address.address, port: port);
-}
-
 /// Returns the package root at [root].
 ///
 /// If [override] is passed, that's used. If the package root doesn't exist, an
 /// [ApplicationException] is thrown.
 String packageRootFor(String root, [String override]) {
   if (root == null) root = p.current;
   var packageRoot = override == null ? p.join(root, 'packages') : override;
 
   if (!new Directory(packageRoot).existsSync()) {
     throw new ApplicationException(
@@ skipping 36 matching lines @@
 ///
 /// This has a built-in race condition: another process may bind this port at
 /// any time after this call has returned. If at all possible, callers should
 /// use [getUnusedPort] instead.
 Future<int> getUnsafeUnusedPort() async {
   var socket = await RawServerSocket.bind(InternetAddress.LOOPBACK_IP_V4, 0);
   var port = socket.port;
   await socket.close();
   return port;
 }