As part of that, I needed to investigate, test and use many alternatives.

The history of **FastAPI** is in great part the history of its predecessors.

As said in the section [Alternatives](alternatives.md){.internal-link target=_blank}:

<blockquote markdown="1">

**FastAPI** wouldn't exist if not for the previous work of others.

class FunctionalTestProject(
    val model: CIBuildModel,
    functionalTestBucketProvider: FunctionalTestBucketProvider,
    val testCoverage: TestCoverage,
    val stage: Stage
) : Project({
    this.id(testCoverage.asId(model))
    this.name = testCoverage.asName()
}) {
    val functionalTests: List<BaseGradleBuildType> = functionalTestBucketProvider.createFunctionalTestsFor(stage, testCoverage)
    init {

It could be just one or two lines of code, like:

```Python
callback_url = "https://example.com/api/v1/invoices/events/"
httpx.post(callback_url, json={"description": "Invoice paid", "paid": True})
```

## 存档回调

实际的回调代码高度依赖于您自己的 API 应用。

并且可能每个应用都各不相同。

回调代码可能只有一两行，比如：

```Python
callback_url = "https://example.com/api/v1/invoices/events/"
requests.post(callback_url, json={"description": "Invoice paid", "paid": True})
```

但回调最重要的部分可能是，根据 API 要发送给回调请求体的数据等内容，确保您的 API 用户（外部开发者）正确地实现*外部 API*。

因此，我们下一步要做的就是添加代码，为从 API 接收回调的*外部 API*存档。

这部分文档在 `/docs` 下的 Swagger API 文档中显示，并且会告诉外部开发者如何构建*外部 API*。

        "admin:CreateUser",
        "admin:DeleteUser",
        "admin:ConfigUpdate"
      ],
      "Effect": "Allow",
      "Sid": ""
    },
    {
      "Action": [
        "s3:*"
      ],
      "Effect": "Allow",
      "Resource": [
        "arn:aws:s3:::*"
      ],
      "Sid": ""
    }
  ]
}
EOF
```

Create new canned policy by name `userManager` using `userManager.json` policy file.

```

## Why is Erasure Code useful?

    }

    private fun determineSubProjectClassTimes(testCoverage: TestCoverage, buildProjectClassTimes: BuildProjectToSubprojectTestClassTimes): Map<String, List<TestClassTime>>? {
        val testCoverageId = testCoverage.asId(MASTER_CHECK_CONFIGURATION)
        return buildProjectClassTimes[testCoverageId] ?: if (testCoverage.testType == TestType.soak) {
            null
        } else {

Es könnten nur eine oder zwei Codezeilen sein, wie zum Beispiel:

```Python
callback_url = "https://example.com/api/v1/invoices/events/"
httpx.post(callback_url, json={"description": "Invoice paid", "paid": True})
```

& ⚫️ 🔜 🎲 🪀 📚 ⚪️➡️ 1️⃣ 📱 ⏭.

⚫️ 💪 1️⃣ ⚖️ 2️⃣ ⏸ 📟, 💖:

```Python
callback_url = "https://example.com/api/v1/invoices/events/"
httpx.post(callback_url, json={"description": "Invoice paid", "paid": True})
```

✋️ 🎲 🏆 ⚠ 🍕 ⏲ ⚒ 💭 👈 👆 🛠️ 👩‍💻 (🔢 👩‍💻) 🛠️ *🔢 🛠️* ☑, 🛄 💽 👈 *👆 🛠️* 🔜 📨 📨 💪 ⏲, ♒️.

, ⚫️❔ 👥 🔜 ⏭ 🚮 📟 📄 ❔ 👈 *🔢 🛠️* 🔜 👀 💖 📨 ⏲ ⚪️➡️ *👆 🛠️*.

```

Quando você cria um gerenciador de contexto ou um gerenciador de contexto assíncrono como mencionado acima, o que ele faz é que, antes de entrar no bloco `with`, ele irá executar o código anterior ao `yield`, e depois de sair do bloco `with`, ele irá executar o código depois do `yield`.

No nosso exemplo de código acima, nós não usamos ele diretamente, mas nós passamos para o FastAPI para ele usá-lo.