Bind to all available loopback addresses in pub.

sdk/lib/_internal/pub/test/test_pub.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.
 
 /// Test infrastructure for testing pub. Unlike typical unit tests, most pub
 /// tests are integration tests that stage some stuff on the file system, run
 /// pub, and then validate the results. This library provides an API to build
 /// tests like that.
 library test_pub;
 
@@ skipping 152 matching lines @@
       return shelf_io.serve((request) {
         currentSchedule.heartbeat();
         var path = request.url.path.replaceFirst("/", "");
         _requestedPaths.add(path);
 
         return validateStream(baseDir.load(path))
             .then((stream) => new shelf.Response.ok(stream))
             .catchError((error) {
           return new shelf.Response.notFound('File "$path" not found.');
         });
-      }, '127.0.0.1', 0).then((server) {
+      }, 'localhost', 0).then((server) {
         _server = server;
         _portCompleter.complete(_server.port);
         currentSchedule.onComplete.schedule(_closeServer);
       });
     });
   }, 'starting a server serving:\n${baseDir.describe()}');
 }
 
 /// Closes [_server]. Returns a [Future] that will complete after the [_server]
 /// is closed.
@@ skipping 344 matching lines @@
 
     if (tokenEndpoint != null) {
       environment['_PUB_TEST_TOKEN_ENDPOINT'] =
         tokenEndpoint.toString();
     }
 
     // If there is a server running, tell pub what its URL is so hosted
     // dependencies will look there.
     if (_hasServer) {
       return port.then((p) {
-        environment['PUB_HOSTED_URL'] = "http://127.0.0.1:$p";
+        environment['PUB_HOSTED_URL'] = "http://localhost:$p";
         return environment;
       });
     }
 
     return environment;
   });
 
   return new PubProcess.start(dartBin, dartArgs, environment: environmentFuture,
       workingDirectory: pathInSandbox(appPath),
       description: args.isEmpty ? 'pub' : 'pub ${args.first}');
@@ skipping 360 matching lines @@
         _lastMatcher.matches(item.last, matchState);
   }
 
   Description describe(Description description) {
     return description.addAll("(", ", ", ")", [_firstMatcher, _lastMatcher]);
   }
 }
 
 /// A [StreamMatcher] that matches multiple lines of output.
 StreamMatcher emitsLines(String output) => inOrder(output.split("\n"));