'Check if a resource still exists in the target web site.
:param url: The resource to verify.
:return: None, the result is stored in self.output_queue'

def _exists_in_target(self, url):

    if (url in self._already_verified):
        return
    self._already_verified.add(url)
    response = self._uri_opener.GET(url, cache=True)
    if (not is_404(response)):
        msg = 'The    URL:    "%s"    was    found    at    archive.org    and    is    STILL    AVAILABLE    in    the    target    site.'
        om.out.debug((msg % url))
        fr = FuzzableRequest(response.get_uri())
        self.output_queue.put(fr)
    else:
        msg = 'The    URL:    "%s"    was    found    at    archive.org    and    was    DELETED    from    the    target    site.'
        om.out.debug((msg % url))
