# OpenAPI Webhooks { #openapi-webhooks }

There are cases where you want to tell your API **users** that your app could call *their* app (sending a request) with some data, normally to **notify** of some type of **event**.

This means that instead of the normal process of your users sending requests to your API, it's **your API** (or your app) that could **send requests to their system** (to their API, their app).

This is normally called a **webhook**.

It enables Brotli support in addition to tranparent Gzip support,
provided Accept-Encoding is not set previously.  Modern web servers
must choose to return Brotli responses.  n.b. It is not used for
sending requests.

```java
OkHttpClient client = new OkHttpClient.Builder()
  .addInterceptor(BrotliInterceptor.INSTANCE)
  .build();
```

```kotlin
implementation("com.squareup.okhttp3:okhttp-brotli:5.1.0")
```

        binding = DcerpcHandle.parseBinding(url);
        url = "smb1://" + binding.server + "/IPC$/" + binding.endpoint.substring(6);

        String params = "", server, address;
        server = (String) binding.getOption("server");
        if (server != null) {
            params += "&server=" + server;
        }
        address = (String) binding.getOption("address");
        if (server != null) {

    }

    @Test
    @DisplayName("Should handle session binding scenarios")
    void testSessionBindingScenarios() throws Exception {
        // Test both true and false session binding
        boolean[] bindingValues = { true, false };

        for (boolean binding : bindingValues) {
            // Given
            Smb2SessionSetupRequest req =

import static org.junit.jupiter.api.Assertions.assertNull;

import org.junit.jupiter.api.Test;

class AvChannelBindingsTest {

    /**
     * Test that the constructor correctly initializes with a valid channel binding hash.
     */
    @Test
    void testConstructorWithValidHash() {
        byte[] testHash = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 };
        AvChannelBindings avChannelBindings = new AvChannelBindings(testHash);

        }
        return null;
    }

    private DcerpcBinding binding;
    private int max_xmit, max_recv;

    /**
     * Construct bind message
     *
     */
    public DcerpcBind() {
    }

    DcerpcBind(final DcerpcBinding binding, final DcerpcHandle handle) {
        this.binding = binding;
        this.max_xmit = handle.getMaxXmit();
        this.max_recv = handle.getMaxRecv();

        }
        return null;
    }

    DcerpcBinding binding;
    int max_xmit, max_recv;

    /**
     * Constructs a new DcerpcBind message.
     */
    public DcerpcBind() {
    }

    DcerpcBind(final DcerpcBinding binding, final DcerpcHandle handle) {
        this.binding = binding;
        max_xmit = handle.max_xmit;
        max_recv = handle.max_recv;
        ptype = 11;

    /**
     * Channel binding is disabled
     */
    public static final int CHANNEL_BINDING_DISABLED = 0;

    /**
     * Channel binding is preferred but not required
     */
    public static final int CHANNEL_BINDING_PREFERRED = 1;

    /**
     * Channel binding is required
     */
    public static final int CHANNEL_BINDING_REQUIRED = 2;

    /**

This module enables [Zstandard (zstd)][1] response compression in addition to Gzip, as long as
the `Accept-Encoding` header is not otherwise set. Web servers must be configured to return zstd
responses.

Note that zstd is not used for sending requests.

```java
OkHttpClient client = new OkHttpClient.Builder()
  .addInterceptor(ZstdInterceptor.INSTANCE)
  .build();
```

```kotlin
implementation("com.squareup.okhttp3:okhttp-zstd:0.0.0")
```

    @Override public Response intercept(Chain chain) throws IOException {
      long t1 = System.nanoTime();
      Request request = chain.request();
      logger.info(String.format("Sending request %s on %s%n%s",
          request.url(), chain.connection(), request.headers()));
      Response response = chain.proceed(request);

      long t2 = System.nanoTime();