val cache: Cache?

    /**
     * Override the [Cache] for the Call.Chain.
     *
     * @throws IllegalStateException if this is a Network Interceptor, since the override is too late.
     */
    fun withCache(cache: Cache?): Chain

    /**
     * Returns the [Proxy] for the OkHttpClient, or an override from the Call.Chain.
     */
    val proxy: Proxy?

    /**