How to use the comiccrawler.error.is_http function in comiccrawler

def download_error(er):
		if is_http(er, code=429):
			# retry doesn't work with 429 error
			sleep(5)
			raise er
		crawler.handle_error(er)
		sleep(5)

def download_error(er):
		if is_http(er, code=429):
			# retry doesn't work with 429 error
			sleep(5)
			raise er
		else:
			crawler.handle_error(er)
			sleep(5)

def errorhandler(err, crawler):
	if is_http(err, 404) and re.search("weibo\.com/[^/]+/[^/]+$", err.request.url):
		raise SkipEpisodeError

def errorhandler(err, crawler):
	if is_http(err, 410) or is_http(err, 404):
		if (re.match(r"https://(live|farm\d+)\.staticflickr\.com/\d+/\d+_[a-z0-9]+_[a-z0-9]{1,2}\.\w+", err.response.url) and
				crawler.ep.image):
			# a specific size is deleted?
			crawler.ep.image = None
			# clear html to refetch the page
			crawler.html = None
			return
			
		if re.match(r"https://www\.flickr\.com/photos/[^/]+/\d+/", err.response.url):
			raise SkipEpisodeError

def errorhandler(err, crawler):
	if is_http(err, 404):
		url = None
		try:
			url = err.response.url
		except AttributeError:
			pass
		if url and is_ep_url(url):
			# deleted by author?
			# https://www.pixiv.net/member_illust.php?mode=medium&illust_id=68059323
			print("Skip {}: {}".format(err.response.url, 404))
			raise SkipEpisodeError