## `jsonable_encoder`の使用

JSON互換のデータのみを受信するデータベース`fake_db`があるとしましょう。

例えば、`datetime`オブジェクトはJSONと互換性がないので、このデーターベースには受け取られません。

そのため、`datetime`オブジェクトは<a href="https://en.wikipedia.org/wiki/ISO_8601" class="external-link" target="_blank">ISO形式</a>のデータを含む`str`に変換されなければなりません。

同様に、このデータベースはPydanticモデル（属性を持つオブジェクト）を受け取らず、`dict`だけを受け取ります。

そのために`jsonable_encoder`を使用することができます。

Pydanticモデルのようなオブジェクトを受け取り、JSON互換版を返します:

# 配置 Swagger UI

你可以配置一些额外的 <a href="https://swagger.io/docs/open-source-tools/swagger-ui/usage/configuration/" class="external-link" target="_blank">Swagger UI 参数</a>.

如果需要配置它们，可以在创建 `FastAPI()` 应用对象时或调用 `get_swagger_ui_html()` 函数时传递 `swagger_ui_parameters` 参数。

`swagger_ui_parameters` 接受一个直接传递给 Swagger UI的字典，包含配置参数键值对。

FastAPI会将这些配置转换为 **JSON**，使其与 JavaScript 兼容，因为这是 Swagger UI 需要的。

## 不使用语法高亮

比如，你可以禁用 Swagger UI 中的语法高亮。

    RequestValidationError,
    ResponseValidationError,
    WebSocketRequestValidationError,
)
from fastapi.testclient import TestClient
from pydantic import BaseModel


class Item(BaseModel):
    id: int
    name: str


class ExceptionCapture:
    def __init__(self):
        self.exception = None

    def capture(self, exc):
        self.exception = exc
        return exc


app = FastAPI()

fun Project.getBuildEnvironmentExtension(): BuildEnvironmentExtension = extensions.getByType(BuildEnvironmentExtension::class.java)

fun Project.getBuildEnvironmentExtensionOrNull(): BuildEnvironmentExtension? = extensions.findByType(BuildEnvironmentExtension::class.java)

fun Project.repoRoot(): Directory = getBuildEnvironmentExtensionOrNull()?.repoRoot?.get() ?: layout.projectDirectory.parentOrRoot()

import org.apache.maven.utils.Os;

/**
 * Assists the project builder. <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.
 *
 * @since 3.0
 */
public class EnvironmentUtils {

    private static Properties envVars;

    /**

import org.eclipse.aether.util.artifact.ArtifactIdUtils;

import static java.util.Objects.requireNonNull;

/**
 * A class building reverse tree using {@link CollectStepData} trace data provided in {@link RepositoryEvent}
 * events fired during collection.
 *
 * @since 3.9.0
 */
class ReverseTreeRepositoryListener extends AbstractRepositoryListener {
    @Override
    public void artifactResolved(RepositoryEvent event) {

FastAPI를 설치할 때 (예: `pip install "fastapi[standard]"` 명령어를 사용할 경우), `fastapi-cli`라는 패키지가 포함됩니다. 이 패키지는 터미널에서 사용할 수 있는 `fastapi` 명령어를 제공합니다.

개발용으로 FastAPI 애플리케이션을 실행하려면 다음과 같이 `fastapi dev` 명령어를 사용할 수 있습니다:

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:single">main.py</u>
<font color="#3465A4">INFO    </font> Using path <font color="#3465A4">main.py</font>

            result[0] = key.toString();
            result[1] = value.toString();

            return result;
        }
    } // class PropertiesReader

    /**
     * This class is used to write properties lines.
     */
    public static class PropertiesWriter extends FilterWriter {
        private boolean typed;

        /**
         * Constructor.
         *

            result[0] = key.toString();
            result[1] = value.toString();

            return result;
        }
    } // class PropertiesReader

    /**
     * This class is used to write properties lines.
     */
    public static class PropertiesWriter extends FilterWriter {
        private boolean typed;

        /**
         * Constructor.
         *

from typing import Union

from fastapi import FastAPI, Header
from pydantic import BaseModel

app = FastAPI()


class CommonHeaders(BaseModel):
    host: str
    save_data: bool
    if_modified_since: Union[str, None] = None
    traceparent: Union[str, None] = None
    x_tag: list[str] = []


@app.get("/items/")
async def read_items(headers: CommonHeaders = Header(convert_underscores=False)):