..versionadded::2.7

The Asset component was introduced in Symfony 2.7.

Symfony by default does not perform asset versioning. You can specify the

Asset versioning is a technique that improves the performance of web

applications by adding a version identifier to the URL of your static assets

(CSS, JavaScript, images, etc.) When the content of the asset changes, the

identifier changes and the browser is forced to download it again instead of

using the cached version.

Symfony supports the basic asset versioning thanks to the

:ref:`version<reference-framework-assets-version>` and

:ref:`version_format<reference-framework-assets-version-format>` configuration

options to add a simple version to all assets (or a specific set of assets

grouped as a:ref:`package<reference-framework-assets-packages>`):

..configuration-block::

..code-block::yaml

..code-block::xml

..code-block::php

However, if you require more control, you need to create a custom version

strategy.

options. If your application requires a more advanced versioning, you can create

your own version strategy.

Default Package