primitiveTypes.add("byte");
        primitiveTypes.add("short");
        primitiveTypes.add("int");
        primitiveTypes.add("long");
        primitiveTypes.add("char");
        primitiveTypes.add("float");
        primitiveTypes.add("double");
        primitiveTypes.add("void");
    }

    public LinkRenderer(Document document, DslDocModel model) {
        this(document, model, GroovySystem.getVersion(), "8");
    }

        return this.forceUnicode;
    }


    /**
     * @return the flags
     */
    public final byte getFlags () {
        return this.flags;
    }


    /**
     * @param flags
     *            the flags to set
     */
    public final void setFlags ( byte flags ) {
        this.flags = flags;
    }


    /**
     * @return the flags2
     */

				// callhome was disabled or context was canceled
				return
			}

			// callhome running on a different node.
			// sleep for some time and try again.
			duration := time.Duration(r.Float64() * float64(globalCallhomeConfig.FrequencyDur()))
			if duration < time.Second {
				// Make sure to sleep at least a second to avoid high CPU ticks.
				duration = time.Second
			}
			time.Sleep(duration)
		}
	}()
}

            false, "Boolean", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnBoost = cci("boost", "boost", null, null, Float.class, "boost", null, false, false, false, "Float", 0,
            0, null, null, false, null, null, null, null, null, false);

            ],
            "msg": "value is not a valid integer",
            "type": "type_error.integer"
        }
    ]
}
```

这是因为路径参数 `item_id` 的值 （`"foo"`）的类型不是 `int`。

值的类型不是 `int ` 而是浮点数（`float`）时也会显示同样的错误，比如： <a href="http://127.0.0.1:8000/items/4.2" class="external-link" target="_blank">http://127.0.0.1:8000/items/4.2。</a>

/// check | "检查"

**FastAPI** 使用 Python 类型声明实现了数据校验。

注意，上面的错误清晰地指出了未通过校验的具体原因。

                        throw e;
                    }
                }
            }
            else if ( trans.hasCapability(SmbConstants.CAP_NT_SMBS) ) {
                int flags = SmbConstants.O_CREAT;
                int sharing = SmbConstants.FILE_SHARE_DELETE | SmbConstants.FILE_SHARE_READ | SmbConstants.FILE_SHARE_WRITE;

            ],
            "msg": "value is not a valid integer",
            "type": "type_error.integer"
        }
    ]
}
```

경로 매개변수 `item_id`는 `int`가 아닌 `"foo"` 값이기 때문입니다.

`int`가 아닌 `float`을 전달하는 경우에도 동일한 오류가 나타납니다: <a href="http://127.0.0.1:8000/items/4.2" class="external-link" target="_blank">http://127.0.0.1:8000/items/4.2</a>

/// check | "확인"

즉, 파이썬 타입 선언을 하면 **FastAPI**는 데이터 검증을 합니다.

            ",maxParameterCount=" + maxParameterCount +
            ",maxDataCount=" + maxDataCount +
            ",maxSetupCount=" + (int)maxSetupCount +
            ",flags=0x" + Hexdump.toHexString( flags, 2 ) +
            ",timeout=" + timeout +
            ",parameterCount=" + parameterCount +
            ",parameterOffset=" + parameterOffset +
            ",parameterDisplacement=" + parameterDisplacement +

        {
            "detail": [
                {
                    "loc": ["body", "price"],
                    "msg": "value is not a valid float",
                    "type": "type_error.float",
                }
            ]
        }
    )


def test_post_with_no_data(client: TestClient):
    response = client.post("/items/", json={})

        {
            "detail": [
                {
                    "loc": ["body", "price"],
                    "msg": "value is not a valid float",
                    "type": "type_error.float",
                }
            ]
        }
    )


@needs_py310
def test_post_with_no_data(client: TestClient):
    response = client.post("/items/", json={})