Fixed #16753 -- Supported network-path references in the syndication...

from django.utils.timezone import is_naive

def add_domain(domain, url, secure=False):

    if not (url.startswith('http://')

    protocol = 'https' if secure else 'http'

    if url.startswith('//'):

        # Support network-path reference (see #16753) - RSS requires a protocol

        url = '%s:%s' % (protocol, url)

    elif not (url.startswith('http://')

            or url.startswith('https://')

            or url.startswith('mailto:')):

        # 'url' must already be ASCII and URL-quoted, so no need for encoding

        # conversions here.

        if secure:

            protocol = 'https'

        else:

            protocol = 'http'

        url = iri_to_uri(u'%s://%s%s' % (protocol, domain, url))

    return url

            views.add_domain('example.com', 'mailto:uhoh@djangoproject.com'),

            'mailto:uhoh@djangoproject.com'

        )

        self.assertEqual(

            views.add_domain('example.com', '//example.com/foo/?arg=value'),

            'http://example.com/foo/?arg=value'

        )