# http.request.uri.path.extension

`http.request.uri.path.extension` String

The lowercased file extension in the URI path without the dot (`.`) character.

This corresponds to the string after the last dot in the URI path, excluding the query string.

If the first character of the last path segment is a dot and the segment does not contain other dot characters, the field value will be an empty string (`""`). Having a dot as the first character does not represent a file extension and is commonly used in UNIX-like systems to denote a hidden file or directory.

Example values:

* If the URI path is `/articles/index.html`, the field value will be `"html"`.
* If the URI path is `/articles/index.`, the field value will be an empty string (`""`).

Example values:

| URI path       | Field value |
| -------------- | ----------- |
| `/foo`         | `""`        |
| `/foo.mp3`     | `"mp3"`     |
| `/.mp3`        | `""`        |
| `/.foo.mp3`    | `"mp3"`     |
| `/foo.tar.bz2` | `"bz2"`     |
| `/foo.`        | `""`        |
| `/foo.MP3`     | `"mp3"`     |

Categories:

* Request
* URI
