def getHostByName(self, name, timeout=None):
    """Get host by name

    Args:
      name: The name of the host.
      timeout: The timeout.

    Return:
      Return host by name.

    """
    if name in dnscache:
        return defer.succeed(dnscache[name])
    # in Twisted<=16.6, getHostByName() is always called with
    # a default timeout of 60s (actually passed as (1, 3, 11, 45) tuple),
    # so the input argument above is simply overridden
    # to enforce Scrapy's DNS_TIMEOUT setting's value
    timeout = (self.timeout,)
    d = super(CachingThreadedResolver, self).getHostByName(name, timeout)
    if dnscache.limit:
        d.addCallback(self._cache_result, name)
    return d