## データバリデーション

しかしブラウザで <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a> を開くと、次のHTTPエラーが表示されます:

```JSON
{
    "detail": [
        {
            "loc": [
                "path",
                "item_id"
            ],
            "msg": "value is not a valid integer",
            "type": "type_error.integer"
        }
    ]
}
```

                exclude_none=exclude_none,
            )
        if is_coroutine:
            value, errors_ = field.validate(response_content, {}, loc=("response",))
        else:
            value, errors_ = await run_in_threadpool(
                field.validate, response_content, {}, loc=("response",)
            )
        if isinstance(errors_, list):
            errors.extend(errors_)
        elif errors_:

   * Excel</a> spreadsheets.
   */
  public static final MediaType MICROSOFT_EXCEL = createConstant(APPLICATION_TYPE, "vnd.ms-excel");

  /**
   * <a href="https://www.loc.gov/preservation/digital/formats/fdd/fdd000379.shtml">Microsoft
   * Outlook</a> items.
   *
   * @since 27.1
   */
  public static final MediaType MICROSOFT_OUTLOOK =

                },
                "ValidationError": {
                    "title": "ValidationError",
                    "required": ["loc", "msg", "type"],
                    "type": "object",
                    "properties": {
                        "loc": {
                            "title": "Location",
                            "type": "array",
                            "items": {

  <mime-type type="application/marc">
    <!-- todo add marc xml <marc:collection> -->
    <glob pattern="*.mrc"/>
    <magic priority="50">
      <!-- built from, e.g. https://www.loc.gov/marc/community/cileader.html -->
      <match value="[0-9]{5,5}" type="regex" offset="0">
        <match value="45" type="string" offset="20">
          <!-- bibliographic -->

* ✅ Fix new/recent tests with new fixed `ValidationError` JSON Schema. PR [#4806](https://github.com/tiangolo/fastapi/pull/4806) by [@tiangolo](https://github.com/tiangolo).
* 🐛 Fix JSON Schema for `ValidationError` at field `loc`. PR [#3810](https://github.com/tiangolo/fastapi/pull/3810) by [@dconathan](https://github.com/dconathan).