-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.

	var region string
	if action == policy.CreateBucketAction {
		// To extract region from XML in request body, get copy of request body.
		payload, err := io.ReadAll(io.LimitReader(r.Body, maxLocationConstraintSize))
		if err != nil {
			authZLogIf(ctx, err, logger.ErrorKind)
			return ErrMalformedXML
		}

		// Populate payload to extract location constraint.
		r.Body = io.NopCloser(bytes.NewReader(payload))

	// Payload for STREAMING signature should be 'STREAMING-AWS4-HMAC-SHA256-PAYLOAD'
	if payload != req.Header.Get(xhttp.AmzContentSha256) {
		return cred, "", "", time.Time{}, ErrContentSHA256Mismatch
	}

	// Extract all the signed headers along with its values.
	extractedSignedHeaders, errCode := extractSignedHeaders(signV4Values.SignedHeaders, r)
	if errCode != ErrNone {
		return cred, "", "", time.Time{}, errCode
	}

  html_url: https://github.com/zhanymkanov/fastapi_production_template
  stars: 1217
  owner_login: zhanymkanov
  owner_html_url: https://github.com/zhanymkanov
- name: langchain-extract
  html_url: https://github.com/langchain-ai/langchain-extract
  stars: 1176
  owner_login: langchain-ai
  owner_html_url: https://github.com/langchain-ai
- name: restish
  html_url: https://github.com/rest-sh/restish
  stars: 1140

---

### Other Search Systems

For proprietary or custom search systems:

#### API-Based Migration

**Step 1: Extract Documents**

Use your current system's API or export functionality to extract:
- Document URLs or identifiers
- Document content/text
- Metadata (title, author, date, etc.)
- Security/access control information

**Step 2: Format for Fess**

import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.annotations.Nullable;
import org.apache.maven.model.interpolation.reflection.MethodMap.AmbiguousException;

/**
 * Using simple dotted expressions to extract the values from an Object instance using JSP-like expressions
 * such as {@code project.build.sourceDirectory}.
 * <p>
 * In addition to usual getters using {@code getXxx} or {@code isXxx} suffixes, accessors

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.

    } else if (test instanceof TestCase) {
      TestCase testCase = (TestCase) test;
      return getMethod(testCase.getClass(), testCase.getName());
    } else {
      throw new IllegalArgumentException("unable to extract method from test: not a TestCase.");
    }
  }

  protected TestSuite makeSuiteForTesterClass(Class<? extends AbstractTester<?>> testerClass) {
    TestSuite candidateTests = new TestSuite(testerClass);

                    final int attributes = pacStream.readInt();
                    resourceGroups[i] = new PacGroup(id, attributes);
                }
            }

            // Extract Extra SIDs
            this.extraSids = new SID[extraSidAtts.length];
            for (int i = 0; i < extraSidAtts.length; i++) {
                this.extraSids[i] = extraSidAtts[i].getId();
            }

        }
    }

    /**
     * Extracts the value from a line using the given pattern.
     * @param pattern the pattern to match against
     * @param line the line to extract the value from
     * @return the extracted value, or null if no match
     */
    protected String getValue(final Pattern pattern, final String line) {
        final Matcher m = pattern.matcher(line);