Comment 0 for bug 1439473

I saw the following exception when trying to set my boot image sync URL to a URL in the format:

http://host/maas/images/ephemeral-v2/releases/

Where 'host' was a valid hostname which would be resolved using the DNS search path (or hosts file).

When attempting to press "Save" on the settings screen, an internal server error was displayed, giving me no indication about what the problem was. The following exception was seen in the logs:

2015-04-01 18:35:58 [HTTPChannel,3,127.0.0.1] 500 Error - /MAAS/settings/
        Traceback (most recent call last):
          File "/usr/lib/python2.7/dist-packages/django/core/handlers/wsgi.py", line 206, in __call__
            response = self.get_response(request)
          File "/usr/lib/python2.7/dist-packages/maasserver/utils/views.py", line 166, in get_response
            response = get_response(request)
          File "/usr/lib/python2.7/dist-packages/maasserver/utils/views.py", line 140, in get_response
            return django_get_response(request)
          File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 194, in get_response
            response = self.handle_uncaught_exception(request, resolver, sys.exc_info())
        --- <exception caught here> ---
          File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 112, in get_response
            response = wrapped_callback(request, *callback_args, **callback_kwargs)
          File "/usr/lib/python2.7/dist-packages/django/contrib/auth/decorators.py", line 22, in _wrapped_view
            return view_func(request, *args, **kwargs)
          File "/usr/lib/python2.7/dist-packages/maasserver/views/settings.py", line 205, in settings
            'boot_source', "Configuration updated.")
          File "/usr/lib/python2.7/dist-packages/maasserver/views/__init__.py", line 219, in process_form
            form.save()
          File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 1408, in save
            boot_source.save()
          File "/usr/lib/python2.7/dist-packages/maasserver/models/cleansave.py", line 37, in save
            self.full_clean()
          File "/usr/lib/python2.7/dist-packages/django/db/models/base.py", line 950, in full_clean
            raise ValidationError(errors)
        django.core.exceptions.ValidationError: {'url': [u'Enter a valid URL.']}