What mechanisms are needed to not lose responses coming through webhooks from HeadHunter?

To avoid losing responses coming through webhook from HeadHunter, it is necessary to ensure reliable processing and acknowledgment of data receipt. Main mechanisms:

1. Idempotency — processing repeated requests without side effects, as the webhook may be sent multiple times.

2. Receipt confirmation — the server should return an HTTP status 200 OK or another code confirming successful receipt, so that HeadHunter does not resend.

3. Message queue — immediately after receiving the webhook, place the data into a queue (e.g., RabbitMQ, Kafka) for asynchronous and reliable processing.

4. Logging and monitoring — record all incoming requests and processing errors for subsequent analysis.

5. Reprocessing and backup storage — save unprocessed messages for reattempts in case of failures.

Example in Go for receiving a webhook with confirmation and placing it into a queue:

func webhookHandler(w http.ResponseWriter, r *http.Request) {
    body, err := ioutil.ReadAll(r.Body)
    if err != nil {
        http.Error(w, "Bad Request", http.StatusBadRequest)
        return
    }
    // Validation and parsing of body

    // Place data into queue for further processing
    err = enqueueMessage(body)
    if err != nil {
        http.Error(w, "Internal Server Error", http.StatusInternalServerError)
        return
    }
    w.WriteHeader(http.StatusOK) // Confirm successful receipt
}