django cache key

cache.py

def _generate_cache_key(request, headerlist, key_prefix):
    """Returns a cache key from the headers given in the header list."""
    ctx = md5_constructor()
    for header in headerlist:
        value = request.META.get(header, None)
        if value is not None:
            ctx.update(value)
    path = md5_constructor(iri_to_uri(request.path))
    cache_key = 'views.decorators.cache.cache_page.%s.%s.%s' % (
        key_prefix, path.hexdigest(), ctx.hexdigest())
    return _i18n_cache_key_suffix(request, cache_key)