# 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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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://dev.ubidots.com/ubifunctions/advanced/async-execution.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.