Duplex calls require HTTP/2. If HTTP/1 is established instead the duplex call will fail. The
    most common use of duplex calls is [gRPC][grpc_http2].

 *  New: Prevent OkHttp from retransmitting a request body by overriding `RequestBody.isOneShot()`.
    This is most useful when writing the request body is destructive.

        add(buildCryptoSx(client)) // 521 - server down
      }
      add(buildChantra(client))
    }
  }

  private fun getByIp(host: String): InetAddress {
    return try {
      InetAddress.getByName(host)
    } catch (e: UnknownHostException) {
      // unlikely
      throw RuntimeException(e)
    }
  }

  names: List<String>,
) {
  var time = System.currentTimeMillis()
  for (dns in dnsProviders) {
    println("Testing ${dns.url}")
    for (host in names) {
      print("$host: ")
      System.out.flush()
      try {
        val results = dns.lookup(host)
        println(results)
      } catch (uhe: UnknownHostException) {
        var e: Throwable? = uhe
        while (e != null) {
          println(e)

    @Override public Socket createSocket(
        Socket socket, String host, int port, boolean autoClose) throws IOException {
      return configureSocket((SSLSocket) delegate.createSocket(socket, host, port, autoClose));
    }

    @Override public Socket createSocket(String host, int port) throws IOException {
      return configureSocket((SSLSocket) delegate.createSocket(host, port));
    }

    @Override public Socket createSocket(

    )
    val interceptor =
      Interceptor { chain: Interceptor.Chain ->
        // The network request has everything: User-Agent, Host, Accept-Encoding.
        val networkRequest = chain.request()
        assertThat(networkRequest.header("User-Agent")).isNotNull()
        assertThat(networkRequest.header("Host")).isEqualTo(
          server.hostName + ":" + server.port,
        )

    ```
 *  Improve cache invalidation for POST-like requests.
 *  Bring MockWebServer into OkHttp and teach it SPDY.


## Version 1.1.1

_2013-06-23_

 * Fix: ClassCastException when caching responses that were redirected from
   HTTP to HTTPS.


## Version 1.1.0

_2013-06-15_

 * Fix: Connection reuse was broken for most HTTPS connections due to a bug in

## [Requests](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-request/)

Each HTTP request contains a URL, a method (like `GET` or `POST`), and a list of headers. Requests may also contain a body: a data stream of a specific content type.

## [Responses](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-response/)

          )
      }

    /**
     * @param host either a regular hostname, International Domain Name, IPv4 address, or IPv6
     * address.
     */
    fun host(host: String) =
      apply {
        val encoded =
          host.percentDecode().toCanonicalHost()
            ?: throw IllegalArgumentException("unexpected host: $host")
        this.host = encoded
      }

    fun port(port: Int) =

      return routes[nextRouteIndex++]
    }
  }

  companion object {
    /** Obtain a host string containing either an actual host name or a numeric IP address. */
    val InetSocketAddress.socketHost: String get() {
      // The InetSocketAddress was specified with a string (either a numeric IP or a host name). If
      // it is a name, all IPs for that name should be tried. If it is an IP address, only that IP

  final OkHttpClient client = new OkHttpClient();

  String post(String url, String json) throws IOException {
    RequestBody body = RequestBody.create(json, JSON);
    Request request = new Request.Builder()
        .url(url)
        .post(body)
        .build();
    try (Response response = client.newCall(request).execute()) {
      return response.body().string();
    }