-d "grant_type=client_credentials" \
  "http://localhost:8080/auth/realms/{realm}/protocol/openid-connect/token"
```

The result will be a JSON document. To invoke the API you need to extract the value of the access_token property. You can then invoke the API by including the value in the Authorization header of requests to the API.

        checkNotDestroyed();

        if (ciphertext == null || ciphertext.length <= GCM_IV_SIZE) {
            return null;
        }

        // Extract IV and ciphertext
        byte[] iv = new byte[GCM_IV_SIZE];
        System.arraycopy(ciphertext, 0, iv, 0, GCM_IV_SIZE);

        byte[] encryptedData = new byte[ciphertext.length - GCM_IV_SIZE];

```Python
async with lifespan(app):
    await do_stuff()
```

Cuando creas un context manager o un async context manager como arriba, lo que hace es que, antes de entrar al bloque `with`, ejecutará el código antes del `yield`, y al salir del bloque `with`, ejecutará el código después del `yield`.

// sumHMAC calculate hmac between two input byte array.
func sumHMAC(key []byte, data []byte) []byte {
	hash := hmac.New(sha256.New, key)
	hash.Write(data)
	return hash.Sum(nil)
}

// extractSignedHeaders extract signed headers from Authorization header
func extractSignedHeaders(signedHeaders []string, r *http.Request) (http.Header, APIErrorCode) {
	reqHeaders := r.Header
	reqQueries := r.Form

				"X-Amz-Content-Sha256": payloadSHA256,
			},
			region:   "us-west-1",
			expected: ErrUnsignedHeaders,
		},
		// (3) Should fail to extract headers if the host header is not signed.
		{
			queryParams: map[string]string{
				"X-Amz-Algorithm":      signV4Algorithm,
				"X-Amz-Date":           now.Format(iso8601Format),
				"X-Amz-Expires":        "60",

            String path = "\\\\server\\share";
            buffer = new DfsReferralRequestBuffer(path, 3);

            int offset = 1000;
            byte[] dst = new byte[offset + buffer.size() + 100]; // Extra space

            int bytesEncoded = buffer.encode(dst, offset);

            assertEquals(buffer.size(), bytesEncoded);

            // Verify data is at correct offset

////

O último `CommonQueryParams`, em:

```Python
... Depends(CommonQueryParams)
```

...é o que o **FastAPI** irá realmente usar para saber qual é a dependência.

É a partir dele que o FastAPI irá extrair os parâmetros passados e será o que o FastAPI irá realmente chamar.

---

Nesse caso, o primeiro `CommonQueryParams`, em:

//// tab | Python 3.8+

```Python
commons: Annotated[CommonQueryParams, ...

////

The last `CommonQueryParams`, in:

```Python
... Depends(CommonQueryParams)
```

...is what **FastAPI** will actually use to know what is the dependency.

It is from this one that FastAPI will extract the declared parameters and that is what FastAPI will actually call.

---

In this case, the first `CommonQueryParams`, in:

//// tab | Python 3.8+

```Python
commons: Annotated[CommonQueryParams, ...

///

## Tipos e Validação

Essas variáveis de ambiente só podem lidar com **strings de texto**, pois são externas ao Python e precisam ser compatíveis com outros programas e com o resto do sistema (e até mesmo com diferentes sistemas operacionais, como Linux, Windows, macOS).

import jakarta.annotation.Resource;

/**
 * {@link HtmlXpathExtractor} is an implementation of the {@link org.codelibs.fess.crawler.extractor.Extractor} interface.
 * It uses XPath expressions to extract text content from HTML documents.
 * <p>
 * This class provides methods to configure the XPath expressions, parser features, and properties.
 * It also includes caching mechanism for XPathAPI instances to improve performance.