FastAPI 0.100.0 同时支持 Pydantic v1 和 v2，会使用你已安装的任一版本。

FastAPI 0.119.0 引入了在 Pydantic v2 内部以 `pydantic.v1` 形式对 Pydantic v1 的部分支持，以便于迁移到 v2。

FastAPI 0.126.0 移除了对 Pydantic v1 的支持，但在一段时间内仍支持 `pydantic.v1`。

/// warning | 警告

从 Python 3.14 开始，Pydantic 团队不再为最新的 Python 版本提供 Pydantic v1 的支持。

这也包括 `pydantic.v1`，在 Python 3.14 及更高版本中不再受支持。

如果你想使用 Python 的最新特性，需要确保使用 Pydantic v2。

///

import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.artifact.DefaultArtifact;
import org.eclipse.aether.repository.RemoteRepository;
import org.eclipse.aether.repository.RepositoryPolicy;

/**
 * <strong>Warning:</strong> This is an internal utility class that is only public for technical reasons, it is not part
 * of the public API. In particular, this class can be changed or deleted without prior notice.
 *

Si por alguna razón necesitas desactivar esta conversión automática, también puedes hacerlo para los modelos Pydantic de parámetros de header.

{* ../../docs_src/header_param_models/tutorial003_an_py310.py hl[19] *}

/// warning | Advertencia

Antes de establecer `convert_underscores` a `False`, ten en cuenta que algunos proxies y servidores HTTP no permiten el uso de headers con guiones bajos.

///

## Resumen { #summary }

Se por algum motivo você precisar desativar essa conversão automática, também poderá fazê-lo para modelos do Pydantic para parâmetros de cabeçalho.

{* ../../docs_src/header_param_models/tutorial003_an_py310.py hl[19] *}

/// warning | Atenção

Antes de definir `convert_underscores` como `False`, tenha em mente que alguns proxies e servidores HTTP não permitem o uso de cabeçalhos com sublinhados.

///

## Resumo { #summary }

但你也希望它能接受新項目；當項目先前不存在時就建立它們，並回傳 HTTP 狀態碼 201 "Created"。

要達成這點，匯入 `JSONResponse`，直接在那裡回傳內容，並設定你想要的 `status_code`：

{* ../../docs_src/additional_status_codes/tutorial001_an_py310.py hl[4,25] *}

/// warning

當你直接回傳一個 `Response`（就像上面的範例），它會原封不動地被送出。

不會再經過模型序列化等處理。

請確認其中包含你要的資料，且各值是合法的 JSON（如果你使用的是 `JSONResponse`）。

///

/// note | 技術細節

你也可以使用 `from starlette.responses import JSONResponse`。

 * as desired per the <a href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator
 * pattern</a>.
 *
 * <p><b>{@code default} method warning:</b> This class does <i>not</i> forward calls to {@code
 * default} methods. Instead, it inherits their default implementations. When those implementations
 * invoke methods, they invoke methods on the {@code ForwardingBlockingQueue}.

///

/// warning | Предупреждение

///

/// warning | Попередження

        }.isEmpty
    }

    options {
        this as StandardJavadocDocletOptions

        encoding = "utf-8"
        docEncoding = "utf-8"
        charSet = "utf-8"

        // Enable all javadoc warnings, except for:
        // - missing: Classes and methods are not required to have javadoc
        // - reference: We allow references to classes that are not part of the compilation

            upgradeGoal.testExecuteWithTargetModel(context, "4.1.0");

            Path mvnDir = projectDir.resolve(".mvn");
            assertTrue(
                    Files.exists(mvnDir),
                    ".mvn directory should be created for 4.1.0 to avoid root directory warnings");
        }

        @Test