the *service* whose id is ``monolog.logger.request``, and not just the *string*

``monolog.logger.request``.

The autoconfigure Option

Above, we've set ``autoconfigure: true`` in the ``_defaults`` section so that it

applies to all services defined in that file. With this setting, the container will

automatically apply certain configuration to your services, based on your service's

*class*. The is mostly used to *auto-tag* your services.

For example, to create a Twig Extension, you need to create a class, register it

as a service, and:doc:`tag</tags>` it with ``twig.extension``:

..configuration-block::

..code-block::yaml

..code-block::xml

..code-block::php

But, with ``autoconfigure: true``, you don't need the tag. In fact, all you need

is this:

..configuration-block::

..code-block::yaml

..code-block::xml

..code-block::php

That's it! The container will find your class in the ``Twig/`` directory and register

it as a service. Then ``autoconfigure`` will add the ``twig.extension`` tag *for*

you, because your class implements ``Twig_ExtensionInterface``. And thanks to ``autowire``,

you can even add ``__construct()`` arguments without any configuration.

Learn more