首先，新建包含一些用于回调的 `APIRouter`。

```Python hl_lines="5  26"
{!../../docs_src/openapi_callbacks/tutorial001.py!}
```

### 创建回调*路径操作*

创建回调*路径操作*也使用之前创建的 `APIRouter`。

它看起来和常规 FastAPI *路径操作*差不多：

* 声明要接收的请求体，例如，`body: InvoiceEvent`
* 还要声明要返回的响应，例如，`response_model=InvoiceEventReceived`

```Python hl_lines="17-19  22-23  29-33"
{!../../docs_src/openapi_callbacks/tutorial001.py!}
```

回调*路径操作*与常规*路径操作*有两点主要区别：

///

```Python hl_lines="1"
{!> ../../docs_src/request_files/tutorial001.py!}
```

////

## Определите параметры `File`

Создайте параметры `File` так же, как вы это делаете для `Body` или `Form`:

//// tab | Python 3.9+

```Python hl_lines="9"
{!> ../../docs_src/request_files/tutorial001_an_py39.py!}
```

////

//// tab | Python 3.6+

```Python hl_lines="8"

			atomic.AddUint64(&globalHTTPStats.rejectedRequestsHeader, 1)
			return
		}
		// Restricting read data to a given maximum length
		r.Body = http.MaxBytesReader(w, r.Body, requestMaxBodySize)
		h.ServeHTTP(w, r)
	})
}

// Reserved bucket.
const (
	minioReservedBucket     = "minio"
	minioReservedBucketPath = SlashSeparator + minioReservedBucket

```Python hl_lines="3  25"
{!../../docs_src/openapi_callbacks/tutorial001.py!}
```

### ✍ ⏲ *➡ 🛠️*

✍ ⏲ *➡ 🛠️* ⚙️ 🎏 `APIRouter` 👆 ✍ 🔛.

⚫️ 🔜 👀 💖 😐 FastAPI *➡ 🛠️*:

* ⚫️ 🔜 🎲 ✔️ 📄 💪 ⚫️ 🔜 📨, ✅ `body: InvoiceEvent`.
*  & ⚫️ 💪 ✔️ 📄 📨 ⚫️ 🔜 📨, ✅ `response_model=InvoiceEventReceived`.

```Python hl_lines="16-18  21-22  28-32"
{!../../docs_src/openapi_callbacks/tutorial001.py!}
```

				t.Fatal(err)
			}

			w := &testResponseWriter{}
			s3Select.Evaluate(w)
			s3Select.Close()
			resp := http.Response{
				StatusCode:    http.StatusOK,
				Body:          io.NopCloser(bytes.NewReader(w.response)),
				ContentLength: int64(len(w.response)),
			}
			res, err := minio.NewSelectResults(&resp, "testbucket")
			if err != nil {
				t.Error(err)
				return
			}

name: Language Change Proposals
description: Changes to the language
labels: ["Proposal", "LanguageChange", "LanguageChangeReview"]
title: "proposal: spec: proposal title"


body:
  - type: markdown
    attributes:
      value: |
       ## Our process for evaluating language changes can be found [here](https://go.googlesource.com/proposal/+/refs/heads/master#language-changes)

  - type: dropdown
    id: author-go-experience
    attributes:

	return l.text
}

// A Macro represents the definition of a #defined macro.
type Macro struct {
	name   string   // The #define name.
	args   []string // Formal arguments.
	tokens []Token  // Body of macro.
}

// Tokenize turns a string into a list of Tokens; used to parse the -D flag and in tests.
func Tokenize(str string) []Token {
	t := NewTokenizer("command line", strings.NewReader(str), nil)

                                            }
                                        ],
                                        "title": "Body",
                                    }
                                )
                                | IsDict(
                                    # TODO: remove when deprecating Pydantic v1

name: Regression
description: Report a problem about something that used to work
labels: [ "a:regression", "to-triage" ]
assignees: [ ]
body:
  - type: markdown
    attributes:
      value: |
        Please use our bug report template to report problems with something that has never worked.
        Regressions reports are greatly appreciated during our RC phase and before a final release.
  - type: textarea
    id: current-behavior
    attributes:

    - 如果驗證失敗，將會返回清楚有用的錯誤訊息。
- 查看 `GET` 請求中是否有命名為 `q` 的查詢參數 (例如 `http://127.0.0.1:8000/items/foo?q=somequery`)。
    - 因為 `q` 參數被宣告為 `= None`，所以是選填的。
    - 如果沒有宣告 `None`，則此參數將會是必填 (例如 `PUT` 範例的請求 body)。
- 對於 `PUT` 的請求 `/items/{item_id}`，將會讀取 body 為 JSON：
    - 驗證是否有必填屬性 `name` 且型別是 `str`。
    - 驗證是否有必填屬性 `price` 且型別是 `float`。
    - 驗證是否有選填屬性 `is_offer` 且型別是 `bool`。
    - 以上驗證都適用於多層次巢狀 JSON 物件。
- 自動轉換 JSON 格式。