### Understand the question

* Check if you can understand what is the **purpose** and use case of the person asking.

* Then check if the question (the vast majority are questions) is **clear**.

          required: true
        - label: >
            I have read and understood the [contribution
            guidelines](https://github.com/google/guava/wiki/HowToContribute#feature-requests).
          required: true
        - label: >
            I have read and understood
            [Guava's philosophy](https://github.com/google/guava/wiki/PhilosophyExplained), and

  // TODO(b/192446998): Remove this override after tools understand nullness better.
  @CheckForNull
  public V put(K key, @ParametricNullness V value) {
    return super.put(key, value);
  }

  @CanIgnoreReturnValue
  @Override
  @SuppressWarnings("RedundantOverride") // b/192446478: RedundantOverride ignores some annotations.
  // TODO(b/192446998): Remove this override after tools understand nullness better.
  @CheckForNull

          required: true
        - label: >
            I have read and understood the [contribution
            guidelines](https://github.com/google/guava/wiki/HowToContribute#feature-requests).
          required: true
        - label: >
            I have read and understood
            [Guava's philosophy](https://github.com/google/guava/wiki/PhilosophyExplained), and

# Support

Here are some resources to help you understand and use Istio:

- For in-depth information about how to use Istio, visit [istio.io](https://istio.io)
- To ask questions and get assistance from our community, visit [GitHub Discussions](https://github.com/istio/istio/discussions)

  // TODO(b/192446998): Remove this override after tools understand nullness better.
  @CheckForNull
  public V put(K key, @ParametricNullness V value) {
    return super.put(key, value);
  }

  @CanIgnoreReturnValue
  @Override
  @SuppressWarnings("RedundantOverride") // b/192446478: RedundantOverride ignores some annotations.
  // TODO(b/192446998): Remove this override after tools understand nullness better.
  @CheckForNull

That doesn't add any extra security to your API, the *path operations* will still be available where they are.

If there's a security flaw in your code, it will still exist.

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## Prerequisites

Let's use the tools provided by **FastAPI** to handle security.

## How it looks

Let's first just use the code and see how it works, and then we'll come back to understand what's happening.

## Create `main.py`

Copy the example in a file `main.py`:

=== "Python 3.9+"

    ```Python
    {!> ../../../docs_src/security/tutorial001_an_py39.py!}
    ```

    @SuppressWarnings("unchecked")
    Class<E> result = classOrNull == null ? (Class<E>) (Class<?>) Object.class : classOrNull;
    return result;
  }

  /*
   * If I understand correctly:
   *
   * This needs to be a @JsMethod so that J2CL knows to look for a JavaScript implemention of
   * it in Platform.native.js. (The JavaScript implementation inline below is visible to *GWT*, but