例如，客户端尝试发送如下表单字段：

* `username`: `Rick`
* `password`: `Portal Gun`
* `extra`: `Mr. Poopybutthole`

他们将收到一条错误响应，表明字段 `extra` 不被允许：

```json
{
    "detail": [
        {
            "type": "extra_forbidden",
            "loc": ["body", "extra"],
            "msg": "Extra inputs are not permitted",
            "input": "Mr. Poopybutthole"
        }
    ]
}
```

## 总结 { #summary }

      .map {
        val suffix = it.path.replace("${prefix}samples/guide/src/main/java/", "")
        suffix
          .replace("(.*)\\.java".toRegex()) { mr ->
            mr.groupValues[1].replace('/', '.')
          }.replace("(.*)\\.kt".toRegex()) { mr ->
            mr.groupValues[1].replace('/', '.') + "Kt"
          }
      }.sorted()
  }
}

@Disabled("Don't run by default")
@Tag("Slow")
class AllMainsTest {

                                                <label for="bulkFile" class="mb-2 mr-2"><la:message
                                                        key="labels.backup_bulk_file"/></label>
                                                <div class="mb-2 mr-sm-2"><input type="file" id="bulkFile"
                                                                                 name="bulkFile"

* `username`: `Rick`
* `password`: `Portal Gun`
* `extra`: `Mr. Poopybutthole`

They will receive an error response telling them that the field `extra` is not allowed:

```json
{
    "detail": [
        {
            "type": "extra_forbidden",
            "loc": ["body", "extra"],
            "msg": "Extra inputs are not permitted",
            "input": "Mr. Poopybutthole"
        }
    ]
}
```

		case healMRFMetaVersionV1:
		default:
			return fmt.Errorf("heal mrf: unknown version: %d", binary.LittleEndian.Uint16(data[2:4]))
		}

		mr := msgp.NewReader(rc)
		for {
			op := PartialOperation{}
			err = op.DecodeMsg(mr)
			if err != nil {
				break
			}
			opCh <- op
		}

		return nil
	}

	globalLocalDrivesMu.RLock()

	OtherToy     Toy `gorm:"polymorphic:Owner;polymorphicValue:hamster_other"`
}

func TestNamedPolymorphic(t *testing.T) {
	DB.Migrator().DropTable(&Hamster{})
	DB.AutoMigrate(&Hamster{})

	hamster := Hamster{Name: "Mr. Hammond", PreferredToy: Toy{Name: "bike"}, OtherToy: Toy{Name: "treadmill"}}
	DB.Save(&hamster)

	hamster2 := Hamster{}
	DB.Preload("PreferredToy").Preload("OtherToy").Find(&hamster2, hamster.Id)

5A12"],["KW",30,"U04A22"],["KZ",20,"F03A13"],["LB",28,"F04A20"],["LC",32,"U04F24"],["LI",21,"F05A12"],["LT",20,"F05F11"],["LU",20,"F03A13"],["LV",21,"U04A13"],["MC",27,"F05F05A11F02"],["MD",24,"U02A18"],["ME",22,"F03F13F02"],["MK",19,"F03A10F02"],["MR",27,"F05F05F11F02"],["MT",31,"U04F05A18"],["MU",30,"U04F02F02F12F03U03"],["NL",18,"U04F10"],["NO",15,"F04F06F01"],["PK",24,"U04A16"],["PL",28,"F08F16"],["PS",29,"U04A21"],["PT",25,"F04F04F11F02"],["RO",24,"U04A16"],["RS",22,"F03F13F02"],["SA",24,"F...

因此，如果您的 API 用户（外部开发者）发送请求到您的 API：

```
https://yourapi.com/invoices/?callback_url=https://www.external.org/events
```

使用如下 JSON 请求体：

```JSON
{
    "id": "2expen51ve",
    "customer": "Mr. Richie Rich",
    "total": "9999"
}
```

然后，您的 API 就会处理发票，并在某个点之后，发送回调请求至 `callback_url`（外部 API）：

```
https://www.external.org/events/invoices/2expen51ve
```

JSON 请求体包含如下内容：

You might notice that to create an instance of a Python class, you use that same syntax.

For example:

```Python
class Cat:
    def __init__(self, name: str):
        self.name = name


fluffy = Cat(name="Mr Fluffy")
```

In this case, `fluffy` is an instance of the class `Cat`.

And to create `fluffy`, you are "calling" `Cat`.

So, a Python class is also a **callable**.

파이썬 클래스의 인스턴스를 만들 때도 같은 문법을 사용한다는 것을 알 수 있을 겁니다.

예를 들어:

```Python
class Cat:
    def __init__(self, name: str):
        self.name = name


fluffy = Cat(name="Mr Fluffy")
```

이 경우 `fluffy`는 클래스 `Cat`의 인스턴스입니다.

그리고 `fluffy`를 만들기 위해 `Cat`을 "호출"하고 있습니다.

따라서 파이썬 클래스도 **호출 가능(callable)**합니다.

그러면 **FastAPI**에서는 파이썬 클래스를 의존성으로 사용할 수 있습니다.