views.py 文件源码

def _redirect_url(request):
    """Redirects to referring page, or CAS_REDIRECT_URL if no referrer is
    set.
    """

    next = request.GET.get(REDIRECT_FIELD_NAME)
    if not next:
        if settings.CAS_IGNORE_REFERER:
            next = settings.CAS_REDIRECT_URL
        else:
            next = request.META.get('HTTP_REFERER', settings.CAS_REDIRECT_URL)

        host = request.get_host()
        prefix = (('http://', 'https://')[request.is_secure()] + host)
        if next.startswith(prefix):
            next = next[len(prefix):]
    return next