How to keep longer http connection

See more:

Java

REST

HTTP

webservice

I have HTTP client:

OkHttpClient client = new OkHttpClient.Builder()
            .connectTimeout(55, TimeUnit.MINUTES) // connect timeout
            .writeTimeout(55, TimeUnit.MINUTES) // write timeout
            .readTimeout(55, TimeUnit.MINUTES) // read timeout
            .build();
    RequestBody body = RequestBody.create(json, JSON);
    Request request = new Request.Builder()
            .url(url)
            .put(body)
            .build();
    try (Response response = client.newCall(request).execute()) {
        return response.body().string();
    } catch (IOException e) {
        e.printStackTrace();
    }

And one put method on the server (implemented in Spark):

put("/putMethod", (request, response) -> {
 
    try {
 
        TimeUnit.MINUTES.sleep(22);
    }
    catch (Exception e) {
        e.printStackTrace();
    }
    return "text";
 
});

The problem: when I set up for example TimeUnit.MINUTES.sleep(10) everything is fine I see return value "text". But when I set up TimeUnit.MINUTES.sleep(20) or longer I do not see return value also I do not see any errors, my client is just waiting and waiting. Do you have any idea what happen ?

What I have tried:

Tried to set up connection timeout - does not work