GuzzleApiRequestConstructor.php

<?php 

...
use Symfony\Component\HttpFoundation\RequestStack;
use GuzzleHttp\Cookie\CookieJar;
...

class GuzzleApiRequest implements ApiRequestInterface {

    /**
     * Constructor
     *
     * @param RequestStack $requestStack
     * @param string $cookieDomain
     * @param string $backendUrl
     * @param string $apiPath
     */
    public function __construct(RequestStack $requestStack, string $cookieDomain, string $backendUrl, string $apiPath) {
        $request = $requestStack->getCurrentRequest();
        $jar = CookieJar::fromArray($request->cookies->all(), $cookieDomain);
        $this->client = new Client([
            'base_uri' => sprintf('%s/%s/', $backendUrl, $apiPath),
            'cookies' => $jar,
            'defaults' => [
                'exceptions' => false,
                'allow_redirects' => false
            ]
        ]);
    }
    
}