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   # Save any defined next value into session
    if REDIRECT_FIELD_NAME in data:
        # Check and sanitize a user-defined GET/POST next field value
        redirect = data[REDIRECT_FIELD_NAME]
        # NOTE: django-sudo's `is_safe_url` is much better at catching bad
        # redirections to different domains than social_auth's
        # `sanitize_redirect` call.
        if not is_safe_url(redirect, host=request.get_host()):
            redirect = DEFAULT_REDIRECT
        request.session[REDIRECT_FIELD_NAME] = redirect or DEFAULT_REDIRECT