* can't coalesce connections that use a proxy, since proxies don't tell us the origin server's IP
   * address.
   */
  private fun routeMatchesAny(candidates: List<Route>): Boolean {
    return candidates.any {
      it.proxy.type() == Proxy.Type.DIRECT &&
        route.proxy.type() == Proxy.Type.DIRECT &&
        route.socketAddress == it.socketAddress
    }
  }

    this because it only occurs if you have proxy configured and you share a connection pool among
    multiple `OkHttpClient` instances.

    This particularly-subtle bug was caused by us assigning each `OkHttpClient` instance its own
    `NullProxySelector` when an explicit proxy is configured. But we don't share connections when
    the proxy selectors are different. Ugh!


## Version 4.2.0

  companion object {
    private const val PROXY_A_PORT = 1001
    private const val PROXY_A_HOST = "proxya"
    private val proxyA =
      Proxy(
        Proxy.Type.HTTP,
        InetSocketAddress.createUnresolved(PROXY_A_HOST, PROXY_A_PORT),
      )

    private const val PROXY_B_PORT = 1002
    private const val PROXY_B_HOST = "proxyb"
    private val proxyB =
      Proxy(
        Proxy.Type.HTTP,

  @Throws(IOException::class)
  private fun connectSocket() {
    val rawSocket =
      when (route.proxy.type()) {
        Proxy.Type.DIRECT, Proxy.Type.HTTP -> route.address.socketFactory.createSocket()!!
        else -> Socket(route.proxy)
      }
    this.rawSocket = rawSocket

    // Handle the race where cancel() precedes connectSocket(). We don't want to miss a cancel.

   * Returns the RFC 7235 authorization challenges appropriate for this response's code. If the
   * response code is 401 unauthorized, this returns the "WWW-Authenticate" challenges. If the
   * response code is 407 proxy unauthorized, this returns the "Proxy-Authenticate" challenges.
   * Otherwise this returns an empty list of challenges.
   *
   * If a challenge uses the `token68` variant instead of auth params, there is exactly one

    val protocols: List<Protocol> = address.protocols()
    val connectionSpecs: List<ConnectionSpec> = address.connectionSpecs()
    val proxySelector: ProxySelector = address.proxySelector()
    val proxy: Proxy? = address.proxy()
    val sslSocketFactory: SSLSocketFactory? = address.sslSocketFactory()
    val hostnameVerifier: HostnameVerifier? = address.hostnameVerifier()

  fun proxyMoveTest(cleanShutdown: Boolean) {
    // Define a single Proxy at myproxy:8008 that will artificially move during the test
    val proxySelector = RecordingProxySelector()
    proxySelector.proxies.add(Proxy(Proxy.Type.HTTP, InetSocketAddress("myproxy", 8008)))

    // Define two host names for the DNS routing of fake proxy servers
    val proxyServer1 = InetAddress.getByAddress("proxyServer1", byteArrayOf(127, 0, 0, 2))

    val method = userResponse.request.method
    when (responseCode) {
      HTTP_PROXY_AUTH -> {
        val selectedProxy = route!!.proxy
        if (selectedProxy.type() != Proxy.Type.HTTP) {
          throw ProtocolException("Received HTTP_PROXY_AUTH (407) code while not using proxy")
        }
        return client.proxyAuthenticator.authenticate(route, userResponse)
      }

      isTlsFallback = false,
    )
  }

  /**
   * Returns a request that creates a TLS tunnel via an HTTP proxy. Everything in the tunnel request
   * is sent unencrypted to the proxy server, so tunnels include only the minimum set of headers.
   * This avoids sending potentially sensitive data like HTTP cookies to the proxy unencrypted.
   *
   * In order to support preemptive authentication we pass a fake "Auth Failed" response to the

        webSocketListener = listener
      }

    /**
     * Configures this response to be served as a response to an HTTP CONNECT request, either for
     * doing HTTPS through an HTTP proxy, or HTTP/2 prior knowledge through an HTTP proxy.
     *
     * When a new connection is received, all in-tunnel responses are served before the connection is
     * upgraded to HTTPS or HTTP/2.
     */
    fun inTunnel() =
      apply {