使用java中的apache `httpclient`对`graphql`端点进行`REST`调用

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.IOException;

public class GraphQLClient {

    public static void main(String[] args) {
        String graphqlEndpoint = "https://api.example.com/graphql";
        String query = "{ \"query\": \"{ user(id: 1) { name, email } }\" }";

        try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
            HttpPost request = new HttpPost(graphqlEndpoint);
            request.setHeader("Content-Type", "application/json");
            request.setEntity(new StringEntity(query));

            try (CloseableHttpResponse response = httpClient.execute(request)) {
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    String result = EntityUtils.toString(entity);
                    System.out.println(result);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}