String unescaped = JsonUtil.unescape(escaped);

// Text tokenization
Tokenizer tokenizer = new Tokenizer("field1,field2,field3", ",");
while (tokenizer.hasMoreTokens()) {
    String token = tokenizer.nextToken();
    // Process each token
}

// Decimal formatting
DecimalFormat format = DecimalFormatUtil.getDecimalFormat("###,###.00");
```

### Exception Handling
```java
import org.codelibs.core.exception.*;

    protected boolean partialResults;

    /** The actual search query executed against the search engine. */
    protected String searchQuery;

    /** Time taken to execute the search query in milliseconds. */
    protected long queryTime;

    /** Timestamp when the search request was made. */
    protected long requestedTime;

      standardClear();
    }

    @Override
    public boolean isEmpty() {
      return standardIsEmpty();
    }

    @Override
    public SortedMap<K, V> subMap(K fromKey, K toKey) {
      return standardSubMap(fromKey, toKey);
    }

    @Override
    public @Nullable Entry<K, V> lowerEntry(K key) {
      return standardLowerEntry(key);
    }

    @Override
    public @Nullable K lowerKey(K key) {

			continue
		}
		if tokenRevokeType != "" {
			claims, err := getClaimsFromTokenWithSecret(ui.Credentials.SessionToken, secret)
			if err != nil {
				continue // skip if token is invalid
			}
			// skip if token type is given and does not match
			if v, _ := claims.Lookup(tokenRevokeTypeClaim); v != tokenRevokeType {
				continue
			}
		}

     */
    protected EditBody createEditBody(final KuromojiItem entity, final String dictId) {
        final EditBody body = new EditBody();
        body.id = entity.getId();
        body.dictId = dictId;
        body.token = entity.getToken();
        body.reading = entity.getReading();
        body.pos = entity.getPos();
        body.segmentation = entity.getSegmentation();
        return body;
    }

            }
        } else {
            server.guid = new byte[16];
            System.arraycopy(buffer, bufferIndex, server.guid, 0, 16);
            server.oemDomainName = new String();
            // ignore SPNEGO token for now ...
        }

        return bufferIndex - start;
    }

    @Override
    public String toString() {

                return StringUtil.EMPTY;
            }

            @Override
            public String getAppEncryptPropertyPattern() {
                return ".*password|.*key|.*token|.*secret";
            }
        };
        ComponentUtil.setFessConfig(fessConfig);
        SystemHelper systemHelper = new SystemHelper() {
            @Override
            public String getProductVersion() {

     */
    int NTLMSSP_REQUEST_INIT_RESPONSE = 0x00100000;

    /**
     * ?? According to spec this is NTLMSSP_NEGOTIATE_IDENTIFY
     *
     * If set, requests an identify level token
     */
    int NTLMSSP_REQUEST_ACCEPT_RESPONSE = 0x00200000;

    /**
     * Requests the usage of the LMOWF
     */
    int NTLMSSP_REQUEST_NON_NT_SESSION_KEY = 0x00400000;

    /**

    }
  }

  /** See https://api.slack.com/methods/rtm.start. */
  public RtmStartResponse rtmStart(String accessToken) throws IOException {
    HttpUrl url = baseUrl.newBuilder("rtm.start")
        .addQueryParameter("token", accessToken)
        .build();
    Request request = new Request.Builder()
        .url(url)
        .build();
    Call call = httpClient.newCall(request);
    try (Response response = call.execute()) {

Pero eso solo permitirá ciertos tipos de comunicación, excluyendo todo lo que implique credenciales: Cookies, headers de autorización como los utilizados con Bearer Tokens, etc.

Así que, para que todo funcione correctamente, es mejor especificar explícitamente los orígenes permitidos.

## Usa `CORSMiddleware`

Puedes configurarlo en tu aplicación **FastAPI** usando el `CORSMiddleware`.