public void run() throws Exception {
    File file = new File("README.md");

    Request request = new Request.Builder()
        .url("https://api.github.com/markdown/raw")
        .post(RequestBody.create(file, MEDIA_TYPE_MARKDOWN))
        .build();

    try (Response response = client.newCall(request).execute()) {
      if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

 *
 *  1. If the current call already has a connection that can satisfy the request it is used. Using
 *     the same connection for an initial exchange and its follow-ups may improve locality.
 *
 *  2. If there is a connection in the pool that can satisfy the request it is used. Note that it is
 *     possible for shared exchanges to make requests to different host names! See
 *     [RealConnection.isEligible] for details.
 *

    }

    /**
     * Configures the request with authentication and SSL settings.
     * @param request the request to configure
     * @return the configured request
     */
    protected CurlRequest request(final CurlRequest request) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String username = fessConfig.getFesenUsername();

A "middleware" is a function that works with every **request** before it is processed by any specific *path operation*. And also with every **response** before returning it.

* It takes each **request** that comes to your application.
* It can then do something to that **request** or run any needed code.
* Then it passes the **request** to be processed by the rest of the application (by some *path operation*).

    /**
     * The unique identifier of the request header.
     */
    public String id;

    /**
     * The name of the request header.
     */
    public String name;

    /**
     * The value of the request header.
     */
    public String value;

    /**
     * The web configuration ID associated with this request header.
     */
    public String webConfigId;

    /**

                // Perform RPC registration
                WitnessRegisterRequest request = new WitnessRegisterRequest();
                request.setVersion(registration.getVersion().getValue());
                request.setShareName(shareName);
                request.setServerAddress(serverAddress.getHostAddress());
                request.setFlags(registration.getFlags());

  fun setUp() {
    platform.assumeOpenJSSE()
  }

  @Test
  fun testTlsv13Works() {
    enableTls()

    server.enqueue(MockResponse(body = "abc"))

    val request = Request(server.url("/"))

    val response = client.newCall(request).execute()

    response.use {
      assertEquals(200, response.code)
      assertEquals(TlsVersion.TLS_1_3, response.handshake?.tlsVersion)

    try {
      while (true) {
        Request request = requestQueue.take();
        Object result;
        try {
          result = invokeMethod(request.methodName, request.arguments);
        } catch (ThreadDeath death) {
          return;
        } catch (InvocationTargetException exception) {
          responseQueue.put(new Response(request.methodName, null, exception.getTargetException()));
          continue;

  }

  @Test @Disabled
  fun request() {
    val request: Request = Request.Builder().build()
    val url: HttpUrl = request.url()
    val method: String = request.method()
    val headers: Headers = request.headers()
    val body: RequestBody? = request.body()
    val cacheControl: CacheControl = request.cacheControl()
  }

  @Test @Disabled
  fun response() {

    sendRequest(client, "https://google.com/robots.txt");
  }

  private void sendRequest(OkHttpClient client, String url) throws IOException {
    Request request = new Request.Builder()
            .url(url)
            .build();
    try (Response response = client.newCall(request).execute()) {
      assertTrue(response.code() == 200 || response.code() == 404);
      assertEquals(Protocol.HTTP_2, response.protocol());