raise InternalError(
            f"The portal gun is too dangerous to be owned by {username}"
        )
    if item_id != "plumbus":
        raise HTTPException(
            status_code=404, detail="Item not found, there's only a plumbus here"
        )

@app.get("/items/{item_id}")
def get_item(item_id: str, username: str = Depends(get_username)):
    if item_id not in data:
        raise HTTPException(status_code=404, detail="Item not found")
    item = data[item_id]
    if item["owner"] != username:
        raise OwnerError(username)

	}

	cred, _, s3Err := checkKeyValid(r, accessKey)
	if s3Err != ErrNone {
		return s3Err
	}

	// Make sure the request has not expired.
	expiresInt, err := strconv.ParseInt(expires, 10, 64)
	if err != nil {
		return ErrMalformedExpires
	}

	// Check if the presigned URL has expired.
	if expiresInt < UTCNow().Unix() {
		return ErrExpiredPresignRequest
	}

Les codes d'état dans la plage des 400 signifient qu'il y a eu une erreur côté client.

Vous souvenez-vous de toutes ces erreurs **« 404 Not Found »** (et des blagues) ?

## Utiliser `HTTPException` { #use-httpexception }

Pour renvoyer au client des réponses HTTP avec des erreurs, vous utilisez `HTTPException`.

            "info": {"title": "FastAPI", "version": "0.1.0"},
            "paths": {
                "/items/{item_id}": {
                    "get": {
                        "responses": {
                            "404": {"description": "Item not found"},
                            "302": {"description": "The item was moved"},
                            "403": {"description": "Not enough privileges"},
                            "200": {

    Request request = new Request.Builder()
            .url(url)
            .build();
    try (Response response = client.newCall(request).execute()) {
      assertTrue(response.code() == 200 || response.code() == 404);
      assertEquals(Protocol.HTTP_2, response.protocol());

      for (Certificate c: response.handshake().peerCertificates()) {
        X509Certificate x = (X509Certificate) c;
        System.out.println(x.getSubjectDN());

    response = client.post("/users/rick")
    assert response.status_code == 405, response.text


def test_invalid_path_doesnt_match():
    response = client.post("/usersx/rick")
    assert response.status_code == 404, response.text


def test_websocket():
    with client.websocket_connect("/items/portal-gun") as websocket:
        data = websocket.receive_json()

本例中，客户端用不存在的 `ID` 请求 `item` 时，触发状态码为 `404` 的异常：

{* ../../docs_src/handling_errors/tutorial001_py310.py hl[11] *}

### 响应结果 { #the-resulting-response }

请求为 `http://example.com/items/foo`（`item_id` 为 `"foo"`）时，客户端会接收到 HTTP 状态码 200 及如下 JSON 响应结果：

```JSON
{
  "item": "The Foo Wrestlers"
}
```

但如果客户端请求 `http://example.com/items/bar`（不存在的 `item_id` `"bar"`），则会接收到 HTTP 状态码 404（“未找到”错误）及如下 JSON 响应结果：

```JSON
{

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

Потім, якщо ви перейдете за URL `/openapi.json`, `/docs` або `/redoc`, ви просто отримаєте помилку `404 Not Found` на кшталт:

```JSON
{
    "detail": "Not Found"
}

// ExpToInt64 - convert input interface value to int64.
func ExpToInt64(expI any) (expAt int64, err error) {
	switch exp := expI.(type) {
	case string:
		expAt, err = strconv.ParseInt(exp, 10, 64)
	case float64:
		expAt, err = int64(exp), nil
	case int64:
		expAt, err = exp, nil
	case int:
		expAt, err = int64(exp), nil
	case uint64:
		expAt, err = int64(exp), nil
	case uint: