keycloak admin api insecure call with unirest

UnirestAdminApiKeycloakTest.java

import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.JsonNode;
import com.mashape.unirest.http.Unirest;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContexts;
import org.junit.Test;

import javax.net.ssl.SSLContext;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;

import static org.assertj.core.api.Assertions.assertThat;

public class UnirestAdminApiKeycloakTest {

    @Test
    public void getAccessToken() throws Exception {
        Unirest.setHttpClient(insecureHttpClient());

        HttpResponse<JsonNode> response = Unirest.post("https://signin.com/auth/realms/master/protocol/openid-connect/token")
                .header("Content-Type", "application/x-www-form-urlencoded")
                .header("Accept", "application/json")
                .header("cache-control", "no-cache")
                .body("client_id=admin-cli&username=admin&password=admin&grant_type=password")
                .asObject(JsonNode.class);

        String json = response.getBody().toString();
        assertThat(json).contains("access_token");

        String token = response.getBody().getObject().getString("access_token");
        assertThat(token).isNotNull();
    }


    private CloseableHttpClient insecureHttpClient() throws NoSuchAlgorithmException, KeyManagementException, KeyStoreException {
        TrustStrategy acceptingTrustStrategy = (X509Certificate[] chain, String authType) -> true;

        SSLContext sslContext = SSLContexts.custom()
                .loadTrustMaterial(null, acceptingTrustStrategy)
                .build();
        SSLConnectionSocketFactory csf = new SSLConnectionSocketFactory(sslContext);

        return HttpClients.custom()
                .setSSLSocketFactory(csf)
                .build();
    }
}