# Response Model - Return Type { #response-model-return-type }

You can declare the type used for the response by annotating the *path operation function* **return type**.

You can use **type annotations** the same way you would for input data in function **parameters**, you can use Pydantic models, lists, dictionaries, scalar values like integers, booleans, etc.

{* ../../docs_src/response_model/tutorial001_01_py310.py hl[16,21] *}

# Learn { #learn }

Here are the introductory sections and the tutorials to learn **FastAPI**.

        bh.consume(LongKeyedBucketOrds.FromSingle.class);
        bh.consume(LongKeyedBucketOrds.FromMany.class);
        bh.consume(LongKeyedBucketOrds.FromManySmall.class);
    }

    /**
     * Emulates a way that we do <strong>not</strong> use {@link LongKeyedBucketOrds}
     * because it is not needed.
     */
    @Benchmark
    public void singleBucketIntoSingleImmutableMonmorphicInvocation(Blackhole bh) {

# About HTTPS { #about-https }

It is easy to assume that HTTPS is something that is just "enabled" or not.

But it is way more complex than that.

/// tip

If you are in a hurry or don't care, continue with the next sections for step by step instructions to set everything up with different techniques.

///

To **learn the basics of HTTPS**, from a consumer perspective, check [https://howhttps.works/](https://howhttps.works/).

You can also use regular `def` functions (without `async`), and use `yield` the same way.

{* ../../docs_src/stream_data/tutorial001_py310.py ln[26:29] hl[27] *}

### No Annotation { #no-annotation }

You don't really need to declare the return type annotation for streaming binary data.

      Runnable task, @ParametricNullness T result);

  /**
   * {@inheritDoc}
   *
   * <p>All elements in the returned list must be {@link ListenableFuture} instances. The easiest
   * way to obtain a {@code List<ListenableFuture<T>>} from this method is an unchecked (but safe)
   * cast:
   *
   * <pre>
   *   {@code @SuppressWarnings("unchecked") // guaranteed by invokeAll contract}

 limitations under the License.
-->
Contributing to Apache Maven
======================

You have found a bug or you have an idea for a cool new feature? Contributing
code is a great way to give something back to the open source community. Before
you dig right into the code, there are a few guidelines that we need
contributors to follow so that we can have a chance of keeping on top of
things.

We can do better...

## What makes a dependency { #what-makes-a-dependency }

Up to now you have seen dependencies declared as functions.

But that's not the only way to declare dependencies (although it would probably be the more common).

The key factor is that a dependency should be a "callable".

A "**callable**" in Python is anything that Python can "call" like a function.

I can reach the key; and if it makes me grow smaller, I can creep
under the door; so either way I'll get into the garden, and I
don't care which happens!'

  She ate a little bit, and said anxiously to herself, `Which
way?  Which way?', holding her hand on the top of her head to
feel which way it was growing, and she was quite surprised to
find that she remained the same size:  to be sure, this generally

But that is still not that useful.

Let's make it give us the current user.

## Create a user model { #create-a-user-model }

First, let's create a Pydantic user model.

The same way we use Pydantic to declare bodies, we can use it anywhere else:

{* ../../docs_src/security/tutorial002_an_py310.py hl[5,12:6] *}

## Create a `get_current_user` dependency { #create-a-get-current-user-dependency }