* to extract configuration information for web and file crawling.
     *
     * @param is the input source containing the GSA configuration XML
     * @throws GsaConfigException if parsing fails due to XML format issues or other errors
     */
    public void parse(final InputSource is) {
        try {
            final SAXParserFactory factory = SAXParserFactory.newInstance();

     * The description of the video.
     * Maximum 2048 characters.
     */
    private String description;

    /**
     * A URL pointing to the actual video media file.
     * Must be one of the supported formats.
     */
    private String contentLoc;

    /**
     * A URL pointing to a player for a specific video.
     * Usually this is the information in the src element of an <embed> tag.
     */

    - tutorial/header-param-models.md
    - tutorial/response-model.md
    - tutorial/extra-models.md
    - tutorial/response-status-code.md
    - tutorial/request-forms.md
    - tutorial/request-form-models.md
    - tutorial/request-files.md
    - tutorial/request-forms-and-files.md
    - tutorial/handling-errors.md
    - tutorial/path-operation-configuration.md
    - tutorial/encoder.md
    - tutorial/body-updates.md

  }

  /**
   * Returns a new {@code TypeResolver} with type variables in {@code formal} mapping to types in
   * {@code actual}.
   *
   * <p>For example, if {@code formal} is a {@code TypeVariable T}, and {@code actual} is {@code
   * String.class}, then {@code new TypeResolver().where(formal, actual)} will {@linkplain
   * #resolveType resolve} {@code ParameterizedType List<T>} to {@code List<String>}, and resolve

                + Arrays.toString(newInputs) + ", newOutput=" + newOutput + "]";
    }

    /**
     * Returns a compact string representation of this mapping item in the format "input1,input2=>output".
     * If the item has pending updates, the new values are used; otherwise, the current values are used.
     *
     * @return compact string representation of the mapping rule
     */

# Моделі форм (Form Models)

У FastAPI Ви можете використовувати **Pydantic-моделі** для оголошення **полів форми**.

/// info | Інформація

Щоб використовувати форми, спочатку встановіть <a href="https://github.com/Kludex/python-multipart" class="external-link" target="_blank">python-multipart</a>.

///

## 表单的 Pydantic 模型

您只需声明一个 **Pydantic 模型**，其中包含您希望接收的**表单字段**，然后将参数声明为 `Form` :

{* ../../docs_src/request_form_models/tutorial001_an_py39.py hl[9:11,15] *}

**FastAPI** 将从请求中的**表单数据**中**提取**出**每个字段**的数据，并提供您定义的 Pydantic 模型。

## 检查文档

您可以在文档 UI 中验证它，地址为 `/docs` ：

<div class="screenshot">
<img src="/img/tutorial/request-form-models/image01.png">
</div>

## 禁止额外的表单字段

        File lmhostsFile = tempDir.resolve("lmhosts_invalid").toFile();
        try (FileWriter writer = new FileWriter(lmhostsFile)) {
            writer.write("192.168 HOST1\n"); // Invalid IP - missing 2 octets (should be skipped)
            writer.write("192.168.1.100 VALIDHOST\n");
            writer.write("not.an.ip HOST2\n"); // Invalid IP format

        return false;
      }
    }
    return true;
  }

  private static IllegalArgumentException formatIllegalArgumentException(
      String format, Object... args) {
    return new IllegalArgumentException(String.format(Locale.ROOT, format, args));
  }

        assertEquals("15 B", format.format(15L));
        assertEquals("999 B", format.format(999L));
        assertEquals("1.0 kB", format.format(1000L));
        assertEquals("5.5 kB", format.format(5500L));
        assertEquals("10 kB", format.format(10L * 1000L));
        assertEquals("15 kB", format.format(15L * 1000L));
        assertEquals("999 kB", format.format(999L * 1000L));
        assertEquals("1.0 MB", format.format(1000L * 1000L));