I tried using GoogleHttpClient of Java

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.api.client.http.GenericUrl;
import com.google.api.client.http.HttpRequest;
import com.google.api.client.http.HttpRequestFactory;
import com.google.api.client.http.UrlEncodedContent;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.JsonObjectParser;
import com.google.api.client.json.jackson2.JacksonFactory;
import lombok.Data;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class Main {

    static JsonFactory JSON_FACTORY = new JacksonFactory();
    static HttpRequestFactory httpRequestFactory = (new NetHttpTransport()).createRequestFactory();

    public static void main(String[] args) throws IOException {
        Map<String, Object> params = new HashMap<>();
        params.put("id", 1234);

        String url = "http://127.0.0.1:8080/user";
        User map = postHttpRequest(url, params, User.class);
        System.out.println(map);
    }

    private static <T> T postHttpRequest(String url, Map<String, Object> params, Class<T> clazz) throws IOException {
        HttpRequest req = httpRequestFactory.buildPostRequest(
                new GenericUrl(url),
                new UrlEncodedContent(params));
        req.setParser(new JsonObjectParser(JSON_FACTORY));

        String json = req.execute().parseAsString();
        return new ObjectMapper().readValue(json, clazz);
    }

    @Data
    public static class User {
        private String id;
    }
}

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