_removeSessionCookie(req, res) {
        const cookies = this._getCookies(req, res);
        cookies.set(this.sessionCookieName, null, this.sessionCookieOptions);
        // If members caching cookies are set, remove them
        if (cookies.get('ghost-access') || cookies.get('ghost-access-hmac')) {
            cookies.set('ghost-access', null, {...this.sessionCookieOptions, signed: false});
            cookies.set('ghost-access-hmac', null, {...this.sessionCookieOptions, signed: false});
        }
    }
@method _removeSessionCookie

@param {Request} req
@param {Response} res