First import `Header`:

{* ../../docs_src/header_params/tutorial001_an_py310.py hl[3] *}

## Declare `Header` parameters { #declare-header-parameters }

Then declare the header parameters using the same structure as with `Path`, `Query` and `Cookie`.

You can define the default value as well as all the extra validation or annotation parameters:

{* ../../docs_src/header_params/tutorial001_an_py310.py hl[9] *}

**FastAPI** provides several tools, at different levels of abstraction, to implement these security features.

In this example we are going to use **OAuth2**, with the **Password** flow, using a **Bearer** token. We do that using the `OAuth2PasswordBearer` class.

/// info

A "bearer" token is not the only option.

But it's the best one for our use case.

      <span style="background-color:#007166"><font color="#D3D7CF"> app </font></span>  Using import string: <font color="#3465A4">main:app</font>

      TestSetGenerator<Entry<K, V>> entrySetGenerator) {
    return SetTestSuiteBuilder.using(entrySetGenerator);
  }

  protected SetTestSuiteBuilder<K> createDerivedKeySetSuite(TestSetGenerator<K> keySetGenerator) {
    return SetTestSuiteBuilder.using(keySetGenerator);
  }

  protected CollectionTestSuiteBuilder<V> createDerivedValueCollectionSuite(

   *       byte is then represented by the 3-character string "%XY", where "XY" is the two-digit,
   *       uppercase, hexadecimal representation of the byte value.
   * </ul>
   *
   * <p>This escaper is suitable for escaping parameter names and values even when <a
   * href="https://www.w3.org/TR/html401/appendix/notes.html#h-B.2.2">using the non-standard

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
 * using {@code asXxx} or {@code toXxx} prefixes are also supported.
 *

 */
@Deprecated(since = "4.0.0")
public class ObjectBasedValueSource extends AbstractValueSource {

    private final Object root;

    /**
     * Construct a new value source, using the supplied object as the root from
     * which to start, and using expressions split at the dot ('.') to navigate
     * the object graph beneath this root.
     * @param root the root of the graph.
     */
    public ObjectBasedValueSource(Object root) {

import org.codelibs.fess.crawler.Constants;
import org.codelibs.fess.crawler.entity.RequestData;
import org.codelibs.fess.crawler.entity.RequestData.Method;

/**
 * Builder class for creating RequestData objects using a fluent interface.
 * This class provides a simple way to construct RequestData objects with method chaining.
 *
 * <p>Usage example:</p>
 * <pre>
 * RequestData request = RequestDataBuilder.newRequestData()

 */
@GwtIncompatible
public class ConcurrentNavigableMapTestSuiteBuilder<K, V>
    extends NavigableMapTestSuiteBuilder<K, V> {

  public static <K, V> ConcurrentNavigableMapTestSuiteBuilder<K, V> using(
      TestSortedMapGenerator<K, V> generator) {
    ConcurrentNavigableMapTestSuiteBuilder<K, V> result =
        new ConcurrentNavigableMapTestSuiteBuilder<>();
    result.usingGenerator(generator);
    return result;

							},
						}, {
							Type:  clause.LeftJoin,
							Table: clause.Table{Name: "companies"},
							Using: []string{"company_name"},
						},
					},
				},
			},
			"SELECT * FROM `users` INNER JOIN `articles` ON `articles`.`id` = `users`.`id` LEFT JOIN `companies` USING (`company_name`)", nil,
		},
	}

	for idx, result := range results {
		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {