def __check_blocked(self, content):
    first_block = content[:512]
    if (('<title>Access to this site is blocked</title>' in content) and ('Websense' in first_block)):
        msg = 'Access to this webpage has been blocked by Websense filtering software in your network.'
        blocked_iframe = self._html_search_regex('<iframe src="([^"]+)"', content, 'Websense information URL', default=None)
        if blocked_iframe:
            msg += (' Visit %s for more details' % blocked_iframe)
        raise ExtractorError(msg, expected=True)
    if ('<title>The URL you requested has been blocked</title>' in first_block):
        msg = 'Access to this webpage has been blocked by Indian censorship. Use a VPN or proxy server (with --proxy) to route around it.'
        block_msg = self._html_search_regex('</h1><p>(.*?)</p>', content, 'block message', default=None)
        if block_msg:
            msg += (' (Message: "%s")' % block_msg.replace('\n', ' '))
        raise ExtractorError(msg, expected=True)
    if (('<title>TTK :: Доступ к ресурсу ограничен</title>' in content) and ('blocklist.rkn.gov.ru' in content)):
        raise ExtractorError('Access to this webpage has been blocked by decision of the Russian government. Visit http://blocklist.rkn.gov.ru/ for a block reason.', expected=True)
def __check_blocked(self, content):
    first_block = content[:512]
    if (('<title>Access to this site is blocked</title>' in content) and ('Websense' in first_block)):
        msg = 'Access to this webpage has been blocked by Websense filtering software in your network.'
        blocked_iframe = self._html_search_regex('<iframe src="([^"]+)"', content, 'Websense information URL', default=None)
        if blocked_iframe:
            msg += (' Visit %s for more details' % blocked_iframe)
        raise ExtractorError(msg, expected=True)
    if ('<title>The URL you requested has been blocked</title>' in first_block):
        msg = 'Access to this webpage has been blocked by Indian censorship. Use a VPN or proxy server (with --proxy) to route around it.'
        block_msg = self._html_search_regex('</h1><p>(.*?)</p>', content, 'block message', default=None)
        if block_msg:
            msg += (' (Message: "%s")' % block_msg.replace('\n', ' '))
        raise ExtractorError(msg, expected=True)
    if (('<title>TTK :: Доступ к ресурсу ограничен</title>' in content) and ('blocklist.rkn.gov.ru' in content)):
        raise ExtractorError('Access to this webpage has been blocked by decision of the Russian government. Visit http://blocklist.rkn.gov.ru/ for a block reason.', expected=True)