위의 예시에서, `item_id`는 `int`로 선언되었습니다.

/// check | 확인

이 기능은 함수 내에서 오류 검사, 자동완성 등의 편집기 기능을 활용할 수 있게 해줍니다.

///

## 데이터 <abbr title="다음으로도 알려져 있습니다: 직렬화, 파싱, 마샬링">변환</abbr>

이 예제를 실행하고 <a href="http://127.0.0.1:8000/items/3" class="external-link" target="_blank">http://127.0.0.1:8000/items/3</a>을 열면, 다음 응답을 볼 수 있습니다:

```JSON
{"item_id":3}
```

/// check | 확인

## Utilize a instância como dependência

Então, nós podemos utilizar este `checker` em um `Depends(checker)`, no lugar de `Depends(FixedContentQueryChecker)`, porque a dependência é a instância, `checker`, e não a própria classe.

E quando a dependência for resolvida, o **FastAPI** chamará este `checker` como:

```Python
checker(q="somequery")
```

		if output[0] == "" {
			// spurious blank caused by Split on "\n"
			output = output[1:]
			continue
		}
		t.Errorf("unexpected output: %q", output[0])
		output = output[1:]
	}

	// Checked printing.
	// Now check machine code layout.

	top := pList.Firstpc
	var text *obj.LSym
	ok = true
	ctxt.DiagFunc = func(format string, args ...interface{}) {
		t.Errorf(format, args...)
		ok = false
	}

    frame.writeByte(Http2.TYPE_HEADERS)
    frame.writeByte(FLAG_END_HEADERS or FLAG_END_STREAM)
    frame.writeInt(expectedStreamId and 0x7fffffff)
    frame.writeAll(headerBytes)

    // Check writer sends the same bytes.
    assertThat(sendHeaderFrames(true, sentHeaders)).isEqualTo(frame)
    reader.nextFrame(
      requireSettings = false,
      object : BaseTestHandler() {
        override fun headers(

This is because it is expected that **your users** would define the actual **URL path** where they want to receive the webhook request in some other way (e.g. a web dashboard).

### Check the docs { #check-the-docs }

Now you can start your app and go to <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

    }

    private void performHealthCheck() {
        log.debug("Performing multi-channel health check");

        for (ChannelGroup channelGroup : sessionChannels.values()) {
            for (ChannelInfo channel : channelGroup.getChannels()) {
                try {
                    // Simplified health check - in real implementation would ping the channel
                    boolean isHealthy = checkChannelHealth(channel);

The important thing to keep in mind is that the `sub` key should have a unique identifier across the entire application, and it should be a string.

## Check it { #check-it }

Run the server and go to the docs: <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

You'll see the user interface like:

///

## Check the Virtual Environment is Active { #check-the-virtual-environment-is-active }

Check that the virtual environment is active (the previous command worked).

/// tip

This is **optional**, but it's a good way to **check** that everything is working as expected and you are using the virtual environment you intended.

///

    // as we cannot call it directly from the test.
    // This requires a package-private or public method in the class under test,
    // or we can just check for the prefix and suffix.
    // For this test, I'll add a helper in the response class to get super.toString()
    // Or, more simply, check the format of the string.
    @Test
    void testToStringFormat() {
        String str = response.toString();

/// info

Notice that `response_description` refers specifically to the response, the `description` refers to the *path operation* in general.

///

/// check

OpenAPI specifies that each *path operation* requires a response description.

So, if you don't provide one, **FastAPI** will automatically generate one of "Successful response".

///