def test_items_with_missing_x_token_header(client: TestClient):
    response = client.get("/items?token=jessica")
    assert response.status_code == 422
    assert response.json() == IsDict(
        {
            "detail": [
                {
                    "type": "missing",
                    "loc": ["header", "x-token"],

@needs_py39
def test_items_with_missing_x_token_header(client: TestClient):
    response = client.get("/items?token=jessica")
    assert response.status_code == 422
    assert response.json() == IsDict(
        {
            "detail": [
                {
                    "type": "missing",
                    "loc": ["header", "x-token"],

def test_query():
    response = client.get("/query")
    assert response.status_code == 422
    assert response.json() == IsDict(
        {
            "detail": [
                {
                    "type": "missing",
                    "loc": ["query", "query"],
                    "msg": "Field required",
                    "input": None,
                }
            ]
        }
    ) | IsDict(

        {
            "detail": [
                {
                    "type": "missing",
                    "loc": ["body", "name"],
                    "msg": "Field required",
                    "input": {},
                },
                {
                    "type": "missing",
                    "loc": ["body", "price"],
                    "msg": "Field required",

        {
            "detail": [
                {
                    "type": "missing",
                    "loc": ["body", "name"],
                    "msg": "Field required",
                    "input": {},
                },
                {
                    "type": "missing",
                    "loc": ["body", "price"],
                    "msg": "Field required",

You will see that every language has all the pages. But some pages are not translated and have an info box at the top, about the missing translation.

Now let's say that you want to add a translation for the section [Features](features.md){.internal-link target=_blank}.

* Copy the file at:

```
docs/en/docs/features.md
```

    ```Python hl_lines="18  23"
    {!> ../../../docs_src/response_model/tutorial001_01.py!}
    ```

FastAPI will use this return type to:

* **Validate** the returned data.

### <a href="https://apispec.readthedocs.io/en/stable/" class="external-link" target="_blank">APISpec</a>

Marshmallow and Webargs provide validation, parsing and serialization as plug-ins.

But documentation is still missing. Then APISpec was created.

It is a plug-in for many frameworks (and there's a plug-in for Starlette too).

{!../../../docs/missing-translation.md!}


<p align="center">
  <a href="https://fastapi.tiangolo.com"><img src="https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png" alt="FastAPI"></a>
</p>
<p align="center">
    FastAPI framework, alte prestazioni, facile da imparare, rapido da implementare, pronto per il rilascio in produzione
</p>
<p align="center">
<a href="https://travis-ci.com/tiangolo/fastapi" target="_blank">

                    "type": "value_error.missing",
                },
                {
                    "loc": ["body", "fileb"],
                    "msg": "field required",
                    "type": "value_error.missing",
                },
                {
                    "loc": ["body", "token"],
                    "msg": "field required",
                    "type": "value_error.missing",
                },
            ]