Hutool 39 New -

HttpResponse res = HttpRequest.get("https://api.example.com")
    .header("X-New", "true")
    .timeout(5000)
    .execute();

HttpRequest now supports asynchronous execution with exponential backoff:

CompletableFuture<String> future = HttpRequest.get("https://slow-api.com/data")
    .timeout(5000)
    .retry(3, RetryStrategy.EXPONENTIAL)
    .executeAsync();

// HttpRequest and HttpUtil simplified usage
String body = HttpUtil.createGet("https://api.example.com/data")
                     .setTimeout(5000)
                     .execute()
                     .body();

LocalDateTime now = DateUtil.localDateTime();
String formatted = DateUtil.format(now, "yyyy-MM-dd HH:mm:ss");

Map<String, Object> merged = MapUtil.merge(mapA, mapB);

Hutool 39 fixes a 4-year-old bug where CSV fields containing \n inside quotes broke parsing. The new CsvReadConfig.setErrorOnDifferentFieldCount(false) gracefully handles malformed rows. hutool 39 new

Hutool 39 leverages JDK 21 features internally. While it runs on Java 8+, using it with JDK 21 unlocks virtual threads and pattern matching. HttpResponse res = HttpRequest