Java HTTP GET JSON with timeout client

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Duration;

public final class JsonGet {
    private static final HttpClient CLIENT = HttpClient.newBuilder()
            .connectTimeout(Duration.ofSeconds(5)).build();

    public static String get(String url, Duration timeout) throws Exception {
        HttpRequest req = HttpRequest.newBuilder(URI.create(url))
                .timeout(timeout).header("Accept", "application/json").GET().build();
        HttpResponse<String> res = CLIENT.send(req, HttpResponse.BodyHandlers.ofString());
        if (res.statusCode() / 100 != 2) throw new IllegalStateException("HTTP " + res.statusCode());
        return res.body();
    }
}