private fun testConnectViaProxy(proxyConfig: ProxyConfig) {
    server.enqueue(
      MockResponse(body = "this response comes via a proxy"),
    )
    val url = "http://android.com/foo".toHttpUrl()
    val response = proxyConfig.connect(server, client, url).execute()
    assertContent("this response comes via a proxy", response)
    val request = server.takeRequest()
    assertThat(request.requestLine).isEqualTo(