def METHOD_NAME(self, language, hash):
    params = {
        'v': 'dreambox',
        'kolejka': 'false',
        'nick': '',
        'pass': '',
        'napios': 'Linux',
        'l': language.alpha2.upper(),
        'f': hash,
        't': get_subhash(hash)}
    logger.info('Searching subtitle %r', params)
    r = self.session.get(self.server_url, params=params, timeout=10)
    r.raise_for_status()
    # handle subtitles not found and errors
    if r.content[:4] == b'NPc0':
        logger.debug('No subtitles found')
        return None
    subtitle = self.subtitle_class(language, hash, release_info=hash)
    subtitle.content = r.content
    logger.debug('Found subtitle %r', subtitle)
    return subtitle