If you want to play with JWT tokens and see how they work, check <a href="https://jwt.io/" class="external-link" target="_blank">https://jwt.io</a>.

## Install `PyJWT` { #install-pyjwt }

We need to install `PyJWT` to generate and verify the JWT tokens in Python.

If your application (somehow) doesn't have to communicate with anything else and wait for it to respond, use `async def`, even if you don't need to use `await` inside.

---

If you just don't know, use normal `def`.

---

**Note**: You can mix `def` and `async def` in your *path operation functions* as much as you need and define each one using the best option for you. FastAPI will do the right thing with them.

    }

    @Test
    @DisplayName("send with multiple params returns the stubbed response")
    void send_withParams_returnsResponse() throws Exception {
        // Arrange
        when(tree.send(eq(request), eq(RequestParam.NO_TIMEOUT), eq(RequestParam.NO_RETRY))).thenReturn(response);

        // Act
        CommonServerMessageBlockResponse out = tree.send(request, RequestParam.NO_TIMEOUT, RequestParam.NO_RETRY);

 *  **Web Sockets are now a stable feature of OkHttp.** Since being introduced as a beta feature in
    OkHttp 2.3 our web socket client has matured. Connect to a server's web socket with
    `OkHttpClient.newWebSocket()`, send messages with `send()`, and receive messages with the
    `WebSocketListener`.

    The `okhttp-ws` submodule is no longer available and `okhttp-ws` artifacts from previous

     */
    public abstract void connect() throws IOException;

    /**
     * Send data using RDMA
     *
     * @param data data buffer to send
     * @param region registered memory region for the data
     * @throws IOException if send fails
     */
    public abstract void send(ByteBuffer data, RdmaMemoryRegion region) throws IOException;

    /**
     * Receive data using RDMA
     *

 */
class Exchange(
  internal val call: RealCall,
  internal val eventListener: EventListener,
  internal val finder: ExchangeFinder,
  private val codec: ExchangeCodec,
) {
  /** True if the request body need not complete before the response body starts. */
  internal var isDuplex: Boolean = false
    private set

  /** True if there was an exception on the connection to the peer. */
  internal var hasFailure: Boolean = false

## Highlights

- Supports source and destination buckets to have the same name unlike AWS S3, addresses variety of use-cases such as *Splunk*, *Veeam* site to site DR.

This is normally called a **webhook**.

## Webhooks steps { #webhooks-steps }

The process normally is that **you define** in your code what is the message that you will send, the **body of the request**.

You also define in some way at which **moments** your app will send those requests or events.

First of all, be nice. 😊

You probably are super nice if you were added to the team, but it's worth mentioning it. 🤓

### When Things are Difficult

When things are great, everything is easier, so that doesn't need much instructions. But when things are difficult, here are some guidelines.

### Import typing's `List` { #import-typings-list }

In Python 3.9 and above you can use the standard `list` to declare these type annotations as we'll see below. 💡

But in Python versions before 3.9 (3.6 and above), you first need to import `List` from standard Python's `typing` module:

{* ../../docs_src/body_nested_models/tutorial002.py hl[1] *}