Provide an API to dart:developer to control the web server hosting the Service Protocol

runtime/observatory/lib/src/repositories/target.dart

 // Copyright (c) 2016, 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.
 
 part of repositories;
 
 class TargetChangeEvent implements M.TargetChangeEvent {
   final TargetRepository repository;
   final bool disconnected;
   TargetChangeEvent(this.repository, [this.disconnected = false]);
@@ skipping 11 matching lines @@
 
   factory TargetRepository() {
     var controller = new StreamController<TargetChangeEvent>();
     var stream = controller.stream.asBroadcastStream();
     return new TargetRepository._(controller, stream);
   }
 
   TargetRepository._(this._onChange, this.onChange) {
     _restore();
     // Add the default address if it doesn't already exist.
-    if (_find(_networkAddressOfDefaultTarget()) == null) {
+    if (find(_networkAddressOfDefaultTarget()) == null) {
       add(_networkAddressOfDefaultTarget());
     }
     // Set the current target to the default target.
-    current = _find(_networkAddressOfDefaultTarget());
+    current = find(_networkAddressOfDefaultTarget());
   }
 
   void add(String address) {
-    if (_find(address) != null) {
+    if (find(address) != null) {
       return;
     }
     _list.insert(0, new SC.WebSocketVMTarget(address));
     _onChange.add(new TargetChangeEvent(this));
     _store();
   }
 
   Iterable<SC.WebSocketVMTarget> list() => _list;
 
   void setCurrent(M.Target t) {
@@ skipping 33 matching lines @@
       return b.lastConnectionTime.compareTo(a.lastConnectionTime);
     });
   }
 
   /// After making a change, update settings.
   void _store() {
     _settings.set(_historyKey, _list);
   }
 
   /// Find by networkAddress.
-  SC.WebSocketVMTarget _find(String networkAddress) {
+  SC.WebSocketVMTarget find(String networkAddress) {
     for (SC.WebSocketVMTarget item in _list) {
       if (item.networkAddress == networkAddress) {
         return item;
       }
     }
     return null;
   }
 
   static String _networkAddressOfDefaultTarget() {
-    if (Utils.runningInJavaScript()) {
-      // We are running as JavaScript, use the same host that Observatory has
-      // been loaded from.
-      return 'ws://${window.location.host}/ws';
-    } else {
-      // Otherwise, assume we are running from Dart Editor and want to connect
-      // to the default host.
-      return 'ws://localhost:8181/ws';
-    }
+    Uri serverAddress = Uri.parse(window.location.toString());
+    return 'ws://${serverAddress.authority}${serverAddress.path}ws';
   }
 }