```Python hl_lines="5  12-16"
    {!> ../../../docs_src/security/tutorial002.py!}
    ```

## Create a `get_current_user` dependency

Let's create a dependency `get_current_user`.

Remember that dependencies can have sub-dependencies?

`get_current_user` will have a dependency with the same `oauth2_scheme` we created before.

		if h2.json && pfa[len(pfa)-1] == '{' {
			state.sep = ""
		}
	}
	// Remember the position in the buffer, in case all attrs are empty.
	pos := state.buf.Len()
	state.openGroups()
	if !state.appendAttrs(as) {
		state.buf.SetLen(pos)
	} else {
		// Remember the new prefix for later keys.
		h2.groupPrefix = state.prefix.String()
		// Remember how many opened groups are in preformattedAttrs,

consecrate - we can not hallow - this ground.
  The brave men, living and dead, who struggled here, have
consecrated it, far above our poor power to add or detract.
The world will little note, nor long remember what we say here,
but it can never forget what they did here.
  It is for us the living, rather, to be dedicated here to the
unfinished work which they who fought here have thus far so

    {!> ../../../docs_src/cookie_params/tutorial001.py!}
    ```

!!! note "Technical Details"
    `Cookie` is a "sister" class of `Path` and `Query`. It also inherits from the same common `Param` class.

    But remember that when you import `Query`, `Path`, `Cookie` and others from `fastapi`, those are actually functions that return special classes.

!!! info

		// all three values to be non-zero, it will use them
		mp.libcallsp = getcallersp()
	} else {
		// Make sure we don't reset libcallsp. This makes
		// libcCall reentrant; We remember the g/pc/sp for the
		// first call on an M, until that libcCall instance
		// returns.  Reentrance only matters for signals, as
		// libc never calls back into Go.  The tricky case is

Isso é útil para operações que precisam acontecer após uma solicitação, mas que o cliente realmente não precisa esperar a operação ser concluída para receber a resposta.

Isso inclui, por exemplo:

- Envio de notificações por email após a realização de uma ação:

# for example k8s.io/cmd/kube-scheduler/app/config/config.go.
#
# By default, structured logging call parameters are checked, but usage of
# those calls is not required. That is changed on a per-file basis.
#
# Remember to clean the golangci-lint cache when changing the configuration and
# running the verify-golangci-lint.sh script multiple times, otherwise
# golangci-lint will report stale results:
#    _output/local/bin/golangci-lint cache clean

    }

    @Override
    public void acceptServiceReferences(List<? extends BuildServiceProvider<?, ?>> serviceReferences) {
        // someone already collected service references for us, just remember them
        consumedServices = serviceReferences;
    }

    @Override
    public boolean hasServiceReferences() {
        return consumedServices != null;
    }

            }
            // resolved, so remember it
            resolvedProvider = Cast.uncheckedCast(results.stream().findFirst().get().getService());
        }
        return resolvedProvider;
    }

    @Nonnull
    @Override
    public Class<T> getType() {

    And Pydantic's `Field` returns an instance of `FieldInfo` as well.

    `Body` also returns objects of a subclass of `FieldInfo` directly. And there are others you will see later that are subclasses of the `Body` class.

    Remember that when you import `Query`, `Path`, and others from `fastapi`, those are actually functions that return special classes.

!!! tip