flask uses 127.0.0.1 as host by default now. stupid chrome.

docs/quickstart.rst

@@ -30,9 +30,9 @@ because this would conflict with Flask itself.
 ::
 
     $ python hello.py
-     * Running on http://localhost:5000/
+     * Running on http://127.0.0.1:5000/
 
-Head over to `http://localhost:5000/ <http://localhost:5000/>`_, you should
+Head over to `http://127.0.0.1:5000/ <http://127.0.0.1:5000/>`_, you should
 see your hello world greeting.
 
 So what did that code do?
@@ -54,19 +54,6 @@ So what did that code do?
 
 To stop the server, hit control-C.
 
-.. admonition:: Troubleshooting
-
-   The browser is unable to access the server?  Sometimes this is
-   unfortunately caused by broken IPv6 support in your operating system,
-   browser or a combination.  For example on Snow Leopard Google Chrome is
-   known to exhibit this behaviour.
-
-   If the browser does not load up the page, you can change the `app.run`
-   call to force IPv4 usage::
-
-      if __name__ == '__main__':
-          app.run(host='127.0.0.1')
-
 
 Debug Mode
 ----------

flask.py

@@ -434,7 +434,7 @@ class Flask(object):
         for func in self.template_context_processors:
             context.update(func())
 
-    def run(self, host='localhost', port=5000, **options):
+    def run(self, host='127.0.0.1', port=5000, **options):
         """Runs the application on a local development server.  If the
         :attr:`debug` flag is set the server will automatically reload
         for code changes and show a debugger in case an exception happened.