///

```Python hl_lines="116-131"
{!> ../../docs_src/security/tutorial004.py!}
```

////

### Technical details about the JWT "subject" `sub`

The JWT specification says that there's a key `sub`, with the subject of the token.

It's optional to use it, but that's where you would put the user's identification, so we are using it here.

/** Benchmark of implementations of {@link ImmutableSet#hashFloodingDetected(Object[])}. */
public class ImmutableSetHashFloodingDetectionBenchmark {
  private static final int TEST_CASES = 0x100;

  @Param({"10", "100", "1000", "10000"})
  int size;

  @Param Impl impl;

  private static final Object[][] tables = new Object[TEST_CASES][];

  @BeforeExperiment
  public void setUp() {

        }
        return (T) arg;
    }

    private Object convertPrimitiveWrapper(final Object arg) {
        return NumberConversionUtil.convertPrimitiveWrapper(propertyType, arg);
    }

    private Object convertNumber(final Object arg) {
        return NumberConversionUtil.convertNumber(propertyType, arg);
    }

    private Object convertDate(final Object arg) {
        if (propertyType == java.util.Date.class) {

	Data []byte `msg:"d,allownil"` // optionally carries object data

	NumVersions      int       `msg:"nv"`
	SuccessorModTime time.Time `msg:"smt"`

	Fresh bool `msg:"fr"` // indicates this is a first time call to write FileInfo.

	// Position of this version or object in a multi-object delete call,
	// no other caller must set this value other than multi-object delete call.
	// usage in other calls in undefined please avoid.

### Set object lock

PutObject API allows setting per object retention mode and retention duration using `x-amz-object-lock-mode` and `x-amz-object-lock-retain-until-date` headers. This takes precedence over any bucket object lock configuration w.r.t retention.

```sh
aws s3api put-object --bucket testbucket --key lockme --object-lock-mode GOVERNANCE --object-lock-retain-until-date "2019-11-20"  --body /etc/issue
```

    private static final long serialVersionUID = 1L;

    private final LruHashMap<E, Object> map;

    // Dummy value to associate with an Object in the backing Map
    private static final Object PRESENT = new Object();

    public LruHashSet(final int limitSize) {
        map = new LruHashMap<>(limitSize);
    }

    /**

* <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.1.0.md#responses-object" class="external-link" target="_blank">OpenAPI Responses Object</a>, it includes the `Response Object`.

        asDocMeta().version(version);
    }

    public void addField(final String key, final Object value) {
        fields.put(key, value);
    }

    public String getLogMessage() {
        return getUrl();
    }

    @Override
    public Map<String, Object> toSource() {
        final Map<String, Object> sourceMap = super.toSource();
        if (fields != null) {
            sourceMap.putAll(fields);
        }

    }

    public void addField(final String key, final Object value) {
        fields.put(key, value);
    }

    public String getLogMessage() {
        return getUrl();
    }

    public LocalDateTime getRequestedAt() {
        return getCreatedAt();
    }

    @Override
    public Map<String, Object> toSource() {
        final Map<String, Object> sourceMap = super.toSource();
        if (fields != null) {

   * be declared as a {@code List}.
   *
   * @return the re-serialized object
   * @throws RuntimeException if the specified object was not successfully serialized or
   *     deserialized
   */
  @CanIgnoreReturnValue
  public static <T> T reserialize(T object) {
    return Platform.reserialize(object);
  }

  /**