Adotar temporariamente esse ponto de vista (do *desenvolvedor externo*) pode ajudar a perceber mais facilmente onde colocar os parâmetros, o modelo Pydantic para o corpo, para a resposta, etc. para essa *API externa*.

///

### Crie um `APIRouter` de callback { #create-a-callback-apirouter }

/*
 * Copyright 2012-2025 CodeLibs Project and the Others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

/*
 * Copyright (C) 2013 Square, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

labels.updatedTime=Bijgewerkt op
labels.urls=URL's
labels.userAgent=User-Agent
labels.username=Gebruikersnaam
labels.value=Waarde
labels.versionNo=Versienummer
labels.cronExpression=Planning
labels.dayForCleanup=Documenten ouder dan de opgegeven datum verwijderen
labels.crawlingThreadCount=Aantal gelijktijdige crawls
labels.boost=Boostwaarde
labels.crawlingConfigName=Naam
labels.crawlingConfigPath=Te crawlen pad
labels.processType=Procestype

E também terá ambas as responses na documentação, uma para `404` e uma para `403`.

///

## O principal `FastAPI` { #the-main-fastapi }

Agora, vamos ver o módulo em `app/main.py`.

Aqui é onde você importa e usa a classe `FastAPI`.

Este será o arquivo principal em seu aplicativo que une tudo.

E como a maior parte de sua lógica agora viverá em seu próprio módulo específico, o arquivo principal será bem simples.

/*
 * © 2025 CodeLibs, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of

            assertEquals(encoded, decoded);
            assertArrayEquals(ciphers, decodedContext.getCiphers());
        }

        @Test
        @DisplayName("Should preserve cipher order")
        void testCipherOrderPreservation() throws SMBProtocolDecodingException {
            int[] ciphers = { 5, 3, 1, 4, 2 };

///

### ドキュメントの確認 { #check-the-docs }

ここでドキュメントを確認すると、追加したメタデータがすべて表示されます:

<img src="/img/tutorial/metadata/image02.png">

### タグの順番 { #order-of-tags }

タグのメタデータ辞書の順序は、ドキュメントUIに表示される順序の定義にもなります。

たとえば、`users` はアルファベット順では `items` の後に続きますが、リストの最初の辞書としてメタデータを追加したため、それより前に表示されます。

## OpenAPI URL { #openapi-url }

デフォルトでは、OpenAPIスキーマは `/openapi.json` で提供されます。

// Copyright (c) 2015-2022 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful

// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful