# Header 1 { #header-1 }

Some text

## Header 2 { #header-2 }

Some more text

### Header 3 { #header-3 }

Even more text

# Header 4 { #header-4 }

A bit more text

# Extra header

# Header 1 { #header-1 }

Some text

## Header 2 { #header-2 }

Some more text

### Header 3 { #header-3 }

Even more text

Header 4 is missing

A bit more text

#Not a header

# Header 1 { #header-1 }

Some text with a link to [FastAPI](https://fastapi.tiangolo.com).

## Header 2 { #header-2 }

Two links here: [How to](https://fastapi.tiangolo.com/how-to/) and [Project Generators](project-generation.md){.internal-link target=_blank}.

### Header 3 { #header-3 }

Another link: [**FastAPI** Project Generators](project-generation.md "Link title"){.internal-link target=_blank} with title.

# Header 4 { #header-4 }

     *       <td>{@code /home/user/myproject/target/classes}</td>
     *       <td>{@code /home/user/myproject/target/classes}</td>
     *       <td>No explicit path → use output directory</td>
     *     </tr>
     *     <tr>
     *       <td>{@code Optional.of(Path.of("META-INF"))}</td>
     *       <td>{@code /home/user/myproject/target/classes}</td>
     *       <td>{@code /home/user/myproject/target/classes/META-INF}</td>

# Advanced Security { #advanced-security }

## Additional Features { #additional-features }

There are some extra features to handle security apart from the ones covered in the [Tutorial - User Guide: Security](../../tutorial/security/index.md).

/// tip

The next sections are **not necessarily "advanced"**.

And it's possible that for your use case, the solution is in one of them.

///

## Read the Tutorial first { #read-the-tutorial-first }

## Враження { #opinions }

"_[...] I'm using **FastAPI** a ton these days. [...] I'm actually planning to use it for all of my team's **ML services at Microsoft**. Some of them are getting integrated into the core **Windows** product and some **Office** products._"

<div style="text-align: right; margin-right: 10%;">Kabir Khan - <strong>Microsoft</strong> <a href="https://github.com/fastapi/fastapi/pull/26"><small>(ref)</small></a></div>

## Do not Separate Schemas { #do-not-separate-schemas }

Now, there are some cases where you might want to have the **same schema for input and output**.

Probably the main use case for this is if you already have some autogenerated client code/SDKs and you don't want to update all the autogenerated client code/SDKs yet, you probably will want to do it at some point, but maybe not right now.

   * @see IntStream#findFirst()
   * @throws NullPointerException if the last element of the stream is null
   */
  public static OptionalInt findLast(IntStream stream) {
    // findLast(Stream) does some allocation, so we might as well box some more
    java.util.Optional<Integer> boxedLast = findLast(stream.boxed());
    return boxedLast.map(OptionalInt::of).orElse(OptionalInt.empty());
  }

  /**

    builders:
      - inject:
          properties-file: '.ci/java-versions.properties'
          properties-content: |
            JAVA_HOME=$HOME/.java/$ES_BUILD_JAVA
            RUNTIME_JAVA_HOME=$HOME/.java/$ES_RUNTIME_JAVA
            geoip_use_service=true
      - shell: |
          #!/usr/local/bin/runbld --redirect-stderr

    response = client.post(
        "/items/", json={"name": "Foo", "price": "50.5", "description": "Some Foo"}
    )
    assert response.status_code == 200
    assert response.json() == {
        "name": "Foo",
        "price": 50.5,
        "description": "Some Foo",
        "tax": None,
    }


def test_post_with_str_float_description_tax(client: TestClient):
    response = client.post(