app/bundles/CoreBundle/IpLookup/AbstractRemoteDataLookup.php

<?php

namespace Mautic\CoreBundle\IpLookup;

use GuzzleHttp\Exception\GuzzleException;

abstract class AbstractRemoteDataLookup extends AbstractLookup
{
    /**
     * Method to use when communicating with the service.
     *
     * @var string
     */
    protected $method = 'get';

    /**
     * Get the URL to fetch data from.
     *
     * @return mixed
     */
    abstract protected function getUrl();

    /**
     * @return mixed
     */
    abstract protected function parseResponse($response);

    /**
     * @return array
     */
    protected function getHeaders()
    {
        return [];
    }

    /**
     * @return array
     */
    protected function getParameters()
    {
        return [];
    }

    /**
     * Fetch data from lookup service.
     */
    protected function lookup()
    {
        $url = $this->getUrl();

        try {
            $response = ('post' == $this->method) ?
                $this->client->post($url, [
                    \GuzzleHttp\RequestOptions::BODY    => $this->getParameters(),
                    \GuzzleHttp\RequestOptions::HEADERS => $this->getHeaders(),
                    \GuzzleHttp\RequestOptions::TIMEOUT => 10,
                ]) :
                $this->client->get($url, [
                    \GuzzleHttp\RequestOptions::HEADERS => $this->getHeaders(),
                    \GuzzleHttp\RequestOptions::TIMEOUT => 10,
                ]);

            $this->parseResponse($response->getBody());
        } catch (GuzzleException $exception) {
            if ($this->logger) {
                $this->logger->warning('IP LOOKUP: '.$exception->getMessage());
            }
        }
    }
}