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+++
title = "event-header"
+++
This extension adds the `Triggering-Event` header to requests. The value of
the header is a JSON serialized version of the event that triggered the
request.
## Install
```html
<script src="https://unpkg.com/htmx.org@1.9.12/dist/ext/event-header.js"></script>
```
## Usage
```html
<button hx-ext="event-header">
Click Me!
</button>
```
Sends something like this:
```txt
Triggering-Event: '{ "isTrusted": false, "htmx-internal-data": { "handled": true }, "screenX": 0, "screenY": 0, "clientX": 0, "clientY": 0, "ctrlKey": false, "shiftKey": false, "altKey": false, "metaKey": false, "button": 0, "buttons": 0, "relatedTarget": null, "pageX": 0, "pageY": 0, "x": 0, "y": 0, "offsetX": 0, "offsetY": 0, "movementX": 0, "movementY": 0, "fromElement": null, "toElement": "button", "layerX": 0, "layerY": 0, "view": "Window", "detail": 0, "sourceCapabilities": null, "which": 1, "NONE": 0, "CAPTURING_PHASE": 1, "AT_TARGET": 2, "BUBBLING_PHASE": 3, "type": "click", "target": "button", "currentTarget": "button", "eventPhase": 2, "bubbles": true, "cancelable": true, "defaultPrevented": true, "composed": true, "timeStamp": 188.86999995447695, "srcElement": "button", "returnValue": false, "cancelBubble": false, "path": [ "button", "div#work-area", "body", "html", "Node", "Window" ] }'
```
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