server.useHttps(handshakeCertificates.sslSocketFactory())
    server.enqueue(
      MockResponse(
        code = HttpURLConnection.HTTP_PROXY_AUTH,
        headers = headersOf("Proxy-Authenticate", "Basic realm=\"localhost\""),
        body = "proxy auth required",
        inTunnel = true,
      ),
    )
    server.enqueue(MockResponse(inTunnel = true))
    server.enqueue(MockResponse())

        .code(responseCode)
        .body("ABCDE")
        .addHeader("WWW-Authenticate: challenge")
    when (responseCode) {
      HttpURLConnection.HTTP_PROXY_AUTH -> {
        builder.addHeader("Proxy-Authenticate: Basic realm=\"protected area\"")
      }

      HttpURLConnection.HTTP_UNAUTHORIZED -> {
        builder.addHeader("WWW-Authenticate: Basic realm=\"protected area\"")