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

    /**
     * Returns a new chain with the specified [Proxy].
     */
    fun withProxy(proxy: Proxy?): Chain

    /**
     * Returns the [ProxySelector] for the OkHttpClient, or an override from the Call.Chain.
     */
    val proxySelector: ProxySelector

    /**