def ouroboros(site, uri):
    # e621 and twentypercentcooler use the same software
    # TODO: load tag file; compare tags, generate title
    #load a list of unimportant tags from a file. possible regex?
    title = ''
    def get_id(link):
        exp = '(.*)show/(?P<id>[0-9]*)/?'
        return re.search(exp, link).group('id')
    post_id = get_id(uri)
    json_data = web.get('https://{0}.net/post/show.json?id={1}'.format(site, post_id))
    postdata = json.loads(json_data, encoding='utf-8')
    tags = postdata['tags']

    ratings = { 's' : 'Safe', 'q' : 'Questionable', 'e' : 'Explicit' }
    if postdata['rating'] in ratings:
        rating = ratings[postdata['rating']]
    else:
        rating = 'Unknown'
    #compare tags to a list of uniportant tags and drop some/most
    tag_file = os.path.expanduser('~/.phenny/boru.py')
    try:
        boru = imp.load_source('boru',tag_file)
    except Exception as e:
        print("Error loading ignore tags: {0} (in head.py)".format(e))
    else:
        filteredtags = tags
        listtags = filteredtags.split()
        filtered = filter(not boru.ignore_tags, listtags)

    filteredlist = str(filtered)
    title = str(filteredlist)
    title = '{0} {1}'.format(rating.capitalize(),title)
    return title