}
					ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
					// Send the payload.
					t := time.Now()
					st, err := conn.NewStream(ctx, handlerTest, payload)
					if err != nil {
						if debugReqs {
							fmt.Println(err.Error())
						}
						b.Fatal(err.Error())
					}
					got := 0
					sent := 0
					go func() {
						for i := 0; i < messages; i++ {

    server.send(message3)
    clientListener.assertTextMessage(message3)

    // Empty client to server message.
    val message4 = ""
    client.send(message4)
    serverListener.assertTextMessage(message4)

    // Server to client message that shares context with message1.
    val message5 = message1 + message1
    server.send(message5)
    clientListener.assertTextMessage(message5)

Returning any error will also cancel the stream remotely.

CAREFUL: When utilizing two-way communication, it is important to ensure that the remote handler is not blocked on a send.
If the remote handler is blocked on a send, and the client is trying to send without the remote receiving, 
the operation would become deadlocked if the channels are full.

### Typed handlers

		}
		_, err := target.store.Put(eventData)
		return err
	}
	if err := target.init(); err != nil {
		return err
	}
	return target.send(eventData)
}

// send - sends an event to the kafka.
func (target *KafkaTarget) send(eventData event.Event) error {
	if target.producer == nil {
		return store.ErrNotConnected
	}
	msg, err := target.toProducerMessage(eventData)
	if err != nil {

        content = f"notification for {email}: {message}"
        email_file.write(content)


@app.post("/send-notification/{email}")
async def send_notification(email: str, background_tasks: BackgroundTasks):
    background_tasks.add_task(write_notification, email, message="some notification")

![ReDoc](https://fastapi.tiangolo.com/img/index/index-06-redoc-02.png)

### Sadece modern Python

Tamamiyle standartlar **Python 3.8**'nın type hintlerine dayanıyor (Pydantic'in sayesinde). Yeni bir syntax öğrenmene gerek yok. Sadece modern Python.

        background_tasks.add_task(write_log, message)
    return q


@app.post("/send-notification/{email}")
async def send_notification(
    email: str, background_tasks: BackgroundTasks, q: str = Depends(get_query)
):
    message = f"message to {email}\n"
    background_tasks.add_task(write_log, message)

		return err
	}
	return target.send(eventData)
}

// IsConnErr - To detect a connection error.
func IsConnErr(err error) bool {
	return xnet.IsConnRefusedErr(err) || err.Error() == "sql: database is closed" || err.Error() == "sql: statement is closed" || err.Error() == "invalid connection"
}

// send - sends an event to the PostgreSQL.
func (target *PostgreSQLTarget) send(eventData event.Event) error {

    client = TestClient(app)
    log = Path("log.txt")
    if log.is_file():
        os.remove(log)  # pragma: no cover
    response = client.post("/send-notification/******@****.***?q=some-query")
    assert response.status_code == 200, response.text
    assert response.json() == {"message": "Message sent"}
    with open("./log.txt") as f:

type TargetStats struct {
	// QueueLength is the queue length if any messages are queued.
	QueueLength int

	// TotalMessages is the total number of messages sent in the lifetime of the target
	TotalMessages int64

	// FailedMessages should log message count that failed to send.
	FailedMessages int64