> For the complete documentation index, see [llms.txt](https://dev.ubidots.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.ubidots.com/ubifunctions/advanced/async-execution.md).

# Async execution

You can invoke a function through its HTTPS endpoint without waiting for a response. To do this, add the `?_blocking=false` parameter to the URL:

{% tabs %}
{% tab title="Request URL" %}

```
https://parse.ubidots.com/prv/username/my-function?_blocking=false
```

{% endtab %}

{% tab title="Async Function Response" %}

```
HTTP/1.1 202 Accepted
Content-Type: application/json

{"activationId":"653ca08ce2104290bca08ce21002909c"}
```

{% endtab %}
{% endtabs %}

{% hint style="info" %}
👍 **Particle Webhooks**

Use **async execution** when sending data to a UbiFunction from external platforms such as [Particle.io](https://particle.io/) or LoRaWAN network servers. This helps prevent failed or timed-out requests, which can affect server ratings.

For example, Particle skips webhook attempts after too many timeouts or 4xx/5xx HTTP status codes. That can lead to data loss in your IoT application. [Learn more](https://docs.particle.io/reference/device-cloud/webhooks/#limits) about Particle's API limits and policy.
{% endhint %}

### Reference

| URL Parameter  | Values                                                                                                                                                                                                                                                                                                                                                                           | Mandatory |
| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------- |
| **\_blocking** | <p><strong>Not specified,</strong> or "<strong>False":</strong><br></p><ul><li><strong>Not specified</strong>: By default, the function returns a response only after execution finishes.</li><li><strong>False</strong>: The function immediately returns a <code>202 Accepted</code> response with a JSON body that includes the function <code>activationId</code>.</li></ul> | No        |


---

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