# Async requests

To improve user experience **Echo** features has been created. This allows to test asynchronous requests, add javascript files, create workers - all from one fiddle, so it is more transparent for the user reading the code. 

Asynchronous requests are split to **HTML**, **JSON**, **JSONP** and **XML**. [*Gist*](http://doc.jsfiddle.net/use/gist_response.html#gist-response) and [*github*](http://doc.jsfiddle.net/use/github_response.html#github-response) responses are similar to the echo feature and go nicely in pair with storing fiddles in [*gist*](http://doc.jsfiddle.net/use/gist_read.html#gist-read) and [*github*](http://doc.jsfiddle.net/use/github_read.html#github-read).

## HTML

**URL:** `/echo/html/`

{% hint style="info" %}
Data has to be provided via **POST**.
{% endhint %}

| Option key | Description                                                           |
| ---------- | --------------------------------------------------------------------- |
| **html**   | Data has to be provided via POST                                      |
| **delay**  | (Optional) It’s a time in seconds after which data should be returned |

{% embed url="<https://jsfiddle.net/6he52mnr/1/>" %}

## JSON

{% hint style="info" %}
Data has to be provided via **POST**.
{% endhint %}

**URL:** `/echo/json/`

| Option key | Descriptio                                                                                                    |
| ---------- | ------------------------------------------------------------------------------------------------------------- |
| **json**   | JSON string representing the object jsFiddle should return. It has to be valid JSON or error will be returned |
| **delay**  | (Optional) It’s a time in seconds after which data should be returned                                         |

\[Missing embed]

## JSONP

{% hint style="info" %}
Data has to be provided via **GET**. JSFiddle will respond all data given in request. It uses URL **with host and protocol** as it’s loaded from different domain. `callback` and `delay` will not be returned.
{% endhint %}

**URL:** `https://jsfiddle.net/echo/jsonp/`

| Option key   | Description                                                           |
| ------------ | --------------------------------------------------------------------- |
| **callback** | name of the jsonp function                                            |
| **delay**    | (Optional) It’s a time in seconds after which data should be returned |

\[Missing embed]

## XML

{% hint style="info" %}
Data has to be provided via **POST**
{% endhint %}

**URL:** `/echo/xml/`

| Option key | Description                                                           |
| ---------- | --------------------------------------------------------------------- |
| **xml**    | Valid string representing XML code                                    |
| **delay**  | (Optional) It’s a time in seconds after which data should be returned |

\[Missing embed]