- Це буде зроблено шляхом надсилання POST-запиту (з вашого API) до деякого зовнішнього API, наданого тим зовнішнім розробником (це і є «зворотний виклик»).

## Звичайний застосунок FastAPI { #the-normal-fastapi-app }

Спочатку подивімося, як виглядав би звичайний застосунок API до додавання зворотного виклику.

     * This method will attempt
     * to resolve SIDs using a cache and cache the results of any SIDs that
     * required resolving with the authority. SID cache entries are currently not
     * expired because under normal circumstances SID information never changes.
     *

        .addEqualityGroup(isNull)
        .addEqualityGroup(Equivalence.identity().equivalentTo("1"))
        .testEquals();
  }

  /*
   * We use large numbers to avoid the integer cache. Normally, we'd accomplish that merely by using
   * `new Integer` (as we do) instead of `Integer.valueOf`. However, under J2KT, `new Integer`
   * gets translated back to `Integer.valueOf` because that is the only thing J2KT can support. And

# Security { #security }

There are many ways to handle security, authentication and authorization.

And it normally is a complex and "difficult" topic.

In many frameworks and systems just handling security and authentication takes a big amount of effort and code (in many cases it can be 50% or more of all the code written).

                """
                The bytes to write to the file.
                """
            ),
        ],
    ) -> None:
        """
        Write some bytes to the file.

        You normally wouldn't use this from a file you read in a request.

        To be awaitable, compatible with async, this is run in threadpool.
        """
        return await super().write(data)

    async def read(
        self,

    public void tearDown() {
        if (rateLimiter != null) {
            rateLimiter.close();
        }
    }

    @Test
    public void testNormalAuthentication() throws Exception {
        // Normal authentication should be allowed
        assertTrue(rateLimiter.checkAttempt("user1", "192.168.1.1"), "First attempt should be allowed");

        // Record success
        rateLimiter.recordSuccess("user1", "192.168.1.1");

你的 API 的使用者（外部開發者）會透過一個 POST 請求在你的 API 中建立一張發票。

然後你的 API 會（讓我們想像）：

* 將發票寄給該外部開發者的某位客戶。
* 代收款項。
* 再把通知回傳給 API 使用者（外部開發者）。
    * 這會透過從「你的 API」向該外部開發者提供的「外部 API」送出 POST 請求完成（這就是「回呼」）。

## 一般的 **FastAPI** 應用 { #the-normal-fastapi-app }

先看看在加入回呼之前，一個一般的 API 應用會長什麼樣子。

它會有一個接收 `Invoice` body 的「路徑操作」，以及一個查詢參數 `callback_url`，其中包含用於回呼的 URL。

這部分很正常，多數程式碼你應該已經很熟悉了：

			}
			x = x<<8 | uint64(c)
		}
		if (x >> 63) > 0 {
			p.err = ErrHeader // Integer overflow
			return 0
		}
		if inv == 0xff {
			return ^int64(x)
		}
		return int64(x)
	}

	// Normal case is base-8 (octal) format.
	return p.parseOctal(b)
}

// formatNumeric encodes x into b using base-8 (octal) encoding if possible.
// Otherwise it will attempt to use base-256 (binary) encoding.

    @Before
    public void setUp() {
        testAnalyzer = new TestSuggestAnalyzer();
        analyzer = testAnalyzer;
    }

    @Test
    public void testAnalyzeWithValidInput() {
        // Test normal analyze with valid input
        String text = "test text";
        String field = "content";
        String lang = "en";

        List<AnalyzeToken> tokens = analyzer.analyze(text, field, lang);

{* ../../docs_src/custom_response/tutorial006c_py310.py hl[2,7,9] *}

### `StreamingResponse` { #streamingresponse }

Nimmt einen asynchronen Generator oder einen normalen Generator/Iterator (eine Funktion mit `yield`) und streamt den Responsebody.

{* ../../docs_src/custom_response/tutorial007_py310.py hl[3,16] *}

/// note | Technische Details